devicesToPublishAsAccessoriesSwitch not showing device, if PowerOn/PowerOff
**Describe the bug**

I'm trying to run two instances of the plugin, as separate platforms, as I'd like to set up a device separately to the TV Control.

However, the second one is only showing up the "Harmony Control" as a Not Supported device (with a house icon), but not the Savisto Candles.

I take note that the Candles don't have a PowerToggle command, only PowerOn and PowerOff, but I have tried using the specific ["Savisto Candles;PowerOn"] and this doesn't appear either.

When I add ["Humax DVR"] which does have PowerToggle, it shows up just fine as a device.

How can I get this device without a PowerToggle to show up? The Readme.md states that it should detect the availability of PowerOn/PowerOff as if PowerToggle

**To Reproduce**
Config.json configured as:

```
  {
    "platform": "HarmonyHubWebSocket",
    "name": "Harmony TV",
    "hubIP": "192.168.1.222",
    "TVPlatformMode" : true,
    "mainActivity" : "Play XBOX One"
  },
{
    "platform": "HarmonyHubWebSocket",
    "name": "Harmony Control",
    "hubIP": "192.168.1.222",
    "publishActivitiesAsIndividualAccessories" : false,
    "activitiesToPublishAsAccessoriesSwitch" : [],
    "publishDevicesAsIndividualAccessories" : true,
    "devicesToPublishAsAccessoriesSwitch" : ["Savisto Candles"],
    "TVPlatformMode" : false
  },

```

***Logs***
[2019-4-28 18:28:47] [Harmony Control] INFO - Command : PowerOff discovered for device : Savisto Candles
[2019-4-28 18:28:47] [Harmony Control] INFO - Command : PowerOn discovered for device : Savisto Candles
[2019-4-28 18:28:47] [Harmony Control] INFO - Command : Blue discovered for device : Savisto Candles
[2019-4-28 18:28:47] [Harmony Control] INFO - Command : Green discovered for device : Savisto Candles
[2019-4-28 18:28:47] [Harmony Control] INFO - Command : Light1 discovered for device : Savisto Candles
etc...


[2019-4-28 18:28:47] [Harmony Control] INFO - Loading devices...
[2019-4-28 18:28:47] [Harmony Control] INFO - Discovered Device : Savisto Candles
[2019-4-28 18:28:47] [Harmony Control] Error - No function found for Savisto Candles

***Details***
HomeBridge version 0.0.49
Harmony Hub version 4.15.250