[BUG] No Volume Controls As Expected
**Describe the bug**
Volume Controls Do Not Show Up On Accessory Screen nor Do Volume Buttons Work

**To Reproduce**
Added the following to my JSON:

```
    {
      "platform": "HarmonyHubWebSocket",
      "name": "Family Room Harmony Hub",
      "hubIP": "10.0.0.X",
      "publishGeneralVolumeSwitches": "TRUE",
      "publishGeneralMuteSwitch": "TRUE",
      "otherPlatforms": [
        {
          "name": "Bedroom Harmony Hub",
          "hubIP": "10.0.0.X",
          "publishGeneralVolumeSwitches": "TRUE",
          "publishGeneralMuteSwitch": "TRUE"
        }
      ]
    }
```

Added both hubs in Homekit and they show up as expected as TVs with the correct Harmony activities as inputs. No Volume switches show up in the Homekit device screen and pushing physical iPhone volume buttons has no effect.

**Expected behavior**
Was expecting a volume up and down button in the TV Accessory screen or the phone HW volume buttons to change the volume of the activities.

**Screenshots**
![2020-12-09 19 10 36](https://user-images.githubusercontent.com/15304664/101717286-da0e5100-3a53-11eb-816f-13a35683a463.png)
![2020-12-09 19 10 44](https://user-images.githubusercontent.com/15304664/101717288-dd094180-3a53-11eb-9fbb-1a437c3506e7.png)


**IOS (please complete the following information):**
- Version 14.2.1
- Device:  iPhone7

**Logs**
```
Dec 09 17:22:41  systemd[1]: Started Homebridge.
Dec 09 17:22:47  homebridge[473]: [12/9/2020, 17:22:46] Loaded config.json with 0 accessories and 2 platforms.
Dec 09 17:22:47  homebridge[473]: [12/9/2020, 17:22:47] ---
Dec 09 17:22:49  homebridge[473]: [12/9/2020, 17:22:49] Loaded plugin: homebridge-harmony@1.4.1
Dec 09 17:22:49  homebridge[473]: [12/9/2020, 17:22:49] Registering platform 'homebridge-harmony.HarmonyHubWebSocket'
Dec 09 17:22:49  homebridge[473]: [12/9/2020, 17:22:49] ---
Dec 09 17:22:49  homebridge[473]: [12/9/2020, 17:22:49] Loaded plugin: homebridge-harmonyhub@0.3.0-alpha.2
Dec 09 17:22:50  homebridge[473]: [12/9/2020, 17:22:50] Registering platform 'homebridge-harmonyhub.HarmonyHub'
Dec 09 17:22:50  homebridge[473]: [12/9/2020, 17:22:50] ---
Dec 09 17:22:51  homebridge[473]: [12/9/2020, 17:22:51] Loaded plugin: homebridge-hubitat-makerapi@0.4.11
Dec 09 17:22:51  homebridge[473]: Homebridge Version: 2.6
Dec 09 17:22:51  homebridge[473]: Plugin Version: 0.4.11
Dec 09 17:22:51  homebridge[473]: [12/9/2020, 17:22:51] Registering platform 'homebridge-hubitat-makerapi.Hubitat-MakerAPI'
Dec 09 17:22:51  homebridge[473]: [12/9/2020, 17:22:51] ---
Dec 09 17:22:51  homebridge[473]: [12/9/2020, 17:22:51] Loading 2 platforms...
Dec 09 17:22:51  homebridge[473]: [12/9/2020, 17:22:51] [Hubitat] Initializing Hubitat-MakerAPI platform...
Dec 09 17:22:52  homebridge[473]: [12/9/2020, 17:22:52] [Family Room Harmony Hub] Initializing HarmonyHubWebSocket platform...
Dec 09 17:22:52  homebridge[473]: [12/9/2020, 17:22:52] [Family Room Harmony Hub] HarmonyPlatform Init
[REDACTED]
Dec 09 17:22:52  homebridge[473]: [12/9/2020, 17:22:52] [Hubitat hhm:0.4.11] Configuration of cached accessories not done, wait for a bit... 85
Dec 09 17:22:52  homebridge[473]: [12/9/2020, 17:22:52] [Family Room Harmony Hub] DidFinishLaunching
Dec 09 17:22:52  homebridge[473]: [12/9/2020, 17:22:52] [Family Room Harmony Hub] (Family Room Harmony Hub)INFO - Loading activities...
Dec 09 17:22:52  homebridge[473]: [12/9/2020, 17:22:52] [Family Room Harmony Hub] (Bedroom Harmony Hub)INFO - Loading activities...
Dec 09 17:22:52  homebridge[473]: Setup Payload:
[REDACTED]
Dec 09 17:22:52  homebridge[473]: [12/9/2020, 17:22:52] Homebridge is running on port [REDACTED].
Dec 09 17:22:53  homebridge[473]: [12/9/2020, 17:22:53] [Hubitat hhm:0.4.11] latest version on npmjs is 0.4.11
Dec 09 17:22:53  homebridge[473]: [12/9/2020, 17:22:53] [Hubitat hhm:0.4.11] your version of the plugin is up2date
Dec 09 17:22:53  homebridge[473]: [12/9/2020, 17:22:53] [Hubitat hhm:0.4.11] Configuration of cached accessories not done, wait for a bit... 85
Dec 09 17:22:53  homebridge[473]: [12/9/2020, 17:22:53] [Family Room Harmony Hub] (Bedroom Harmony Hub)INFO - Adding Accessory : Bedroom Harmony Hub-TV
Dec 09 17:22:53  homebridge[473]: [12/9/2020, 17:22:53] [Family Room Harmony Hub] (Bedroom Harmony Hub)INFO - configuring Main TV Service
Dec 09 17:22:53  homebridge[473]: [12/9/2020, 17:22:53] [Family Room Harmony Hub] (Bedroom Harmony Hub)INFO - Creating TV Service
Dec 09 17:22:53  homebridge[473]: [12/9/2020, 17:22:53] [Family Room Harmony Hub] (Bedroom Harmony Hub)INFO - Creating Input Service - Bedroom Roku
Dec 09 17:22:53  homebridge[473]: [12/9/2020, 17:22:53] [Family Room Harmony Hub] (Bedroom Harmony Hub)WARNING - No main Activity that match config file found, default to first one
Dec 09 17:22:53  homebridge[473]: [12/9/2020, 17:22:53] [Family Room Harmony Hub] (Bedroom Harmony Hub)INFO - Configuring Main Activity Bedroom Roku
Dec 09 17:22:53  homebridge[473]: [12/9/2020, 17:22:53] [Family Room Harmony Hub] (Bedroom Harmony Hub)INFO - Creating TV Speaker Service
Dec 09 17:22:53  homebridge[473]: [12/9/2020, 17:22:53] [Family Room Harmony Hub] (Bedroom Harmony Hub)INFO - setupFoundAccessories - TV accessory added as external accessory
Dec 09 17:22:53  homebridge[473]: [12/9/2020, 17:22:53] Bedroom Harmony Hub-TV is running on port [REDACTED].
Dec 09 17:22:53  homebridge[473]: [12/9/2020, 17:22:53] Please add [Bedroom Harmony Hub-TV] manually in Home app. Setup Code: [REDACTED]
Dec 09 17:22:54  homebridge[473]: [12/9/2020, 17:22:54] [Family Room Harmony Hub] (Family Room Harmony Hub)INFO - Adding Accessory : Family Room Harmony Hub-TV
Dec 09 17:22:54  homebridge[473]: [12/9/2020, 17:22:54] [Family Room Harmony Hub] (Family Room Harmony Hub)INFO - configuring Main TV Service
Dec 09 17:22:54  homebridge[473]: [12/9/2020, 17:22:54] [Family Room Harmony Hub] (Family Room Harmony Hub)INFO - Creating TV Service
Dec 09 17:22:54  homebridge[473]: [12/9/2020, 17:22:54] [Family Room Harmony Hub] (Family Room Harmony Hub)INFO - Creating Input Service - Netflix
Dec 09 17:22:54  homebridge[473]: [12/9/2020, 17:22:54] [Family Room Harmony Hub] (Family Room Harmony Hub)INFO - Creating Input Service - Apple TV
Dec 09 17:22:54  homebridge[473]: [12/9/2020, 17:22:54] [Family Room Harmony Hub] (Family Room Harmony Hub)INFO - Creating Input Service - Plex
Dec 09 17:22:54  homebridge[473]: [12/9/2020, 17:22:54] [Family Room Harmony Hub] (Family Room Harmony Hub)INFO - Creating Input Service - Amazon Video
Dec 09 17:22:54  homebridge[473]: [12/9/2020, 17:22:54] [Family Room Harmony Hub] (Family Room Harmony Hub)INFO - Creating Input Service - Live TV
Dec 09 17:22:54  homebridge[473]: [12/9/2020, 17:22:54] [Family Room Harmony Hub] (Family Room Harmony Hub)INFO - Creating Input Service - Roku
Dec 09 17:22:54  homebridge[473]: [12/9/2020, 17:22:54] [Family Room Harmony Hub] (Family Room Harmony Hub)WARNING - No main Activity that match config file found, default to first one
Dec 09 17:22:54  homebridge[473]: [12/9/2020, 17:22:54] [Family Room Harmony Hub] (Family Room Harmony Hub)INFO - Configuring Main Activity Netflix
Dec 09 17:22:54  homebridge[473]: [12/9/2020, 17:22:54] [Family Room Harmony Hub] (Family Room Harmony Hub)INFO - Creating TV Speaker Service
Dec 09 17:22:54  homebridge[473]: [12/9/2020, 17:22:54] [Family Room Harmony Hub] (Family Room Harmony Hub)INFO - setupFoundAccessories - TV accessory added as external accessory
Dec 09 17:22:54  homebridge[473]: [12/9/2020, 17:22:54] Family Room Harmony Hub-TV is running on port [REDACTED].
```

**Config**
```
    {
      "platform": "HarmonyHubWebSocket",
      "name": "Family Room Harmony Hub",
      "hubIP": "10.0.0.X",
      "publishGeneralVolumeSwitches": "TRUE",
      "publishGeneralMuteSwitch": "TRUE",
      "otherPlatforms": [
        {
          "name": "Bedroom Harmony Hub",
          "hubIP": "10.0.0.X",
          "publishGeneralVolumeSwitches": "TRUE",
          "publishGeneralMuteSwitch": "TRUE"
        }
      ]
    }
```

**Additional context**
Add any other context about the problem here.
