[BUG] After 1.3.8 update, devicesToPublishAsAccessoriesSwitch not working
**Describe the bug**
After upgrading to 1.3.8, none of the devices listed under `devicesToPublishAsAccessoriesSwitches` are responsive. They appear in the iOS Home app correctly, but pressing the buttons does not do anything. (I've tried removing and re-adding the entire Homebridge Bridge from the iOS Home app, but the issue continues.) The same issue is true of the generalized mute switch under 'publishGeneralMuteSwitch: true'

**To Reproduce**
Add this to the config file:
```
"devicesToPublishAsAccessoriesSwitch": [
                "Vizio TV|TV Volume Up;VolumeUp|100;VolumeUp|100;VolumeUp",
                "Vizio TV|TV Volume Down;VolumeDown|100;VolumeDown|100;VolumeDown",
                "Xfinity Box|Watch CNN;Number8|100;Number1|100;Number7|100;Select",
                "Xfinity Box|Watch MSNBC;Number8|100;Number1|100;Number8|100;Select"]
```

**Expected behavior**
When pushing the "Watch CNN" activity tile in iOS Home app, the programmed sequence of button commands should be sent to Harmony Hub. 
(Note: I've double-checked to make sure that the name of the devices are exactly as it appears in Harmony Hub. Also, this was working fine before the update and I have not changed any settings.)

**Screenshots**
When launching Homebridge, the following error message shows up in the log:
 https://ibb.co/Hd4q1pc
```

(node:395) UnhandledPromiseRejectionWarning: Error: Cannot add a Service with the same UUID '0 00000DA-0000-1000-8000-0026BB765291' as another Service in this Accessory without also definin g a unique 'subtype' property. 

at Accessory._this.addService (/usr/local/lib/node_modules/homebridge/node_modules/hap-nod ejs/src/lib/Accessory.ts:276:17) 

at PlatformAccessory.addService (/usr/local/lib/node_modules/homebridge/src/platformAccess ory.ts:92:41) 

at HarmonySubPlatform.readTVAccessories (/homebridge/node_modules/homebridge-harmony/harmo nySubPlatform.js:298:24) 

at HarmonySubPlatform.readAccessories (/homebridge/node_modules/homebridge-harmony/harmony SubPlatform.js:158:58) 

at /homebridge/nodemodules/homebridge-harmony/harmonyBase. is: 93:27 

(node:395) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originate d either by throwing inside of an async function without a catch block, or by rejecting a prom ise which was not handled with .catch(). (rejection id: 1) 

(node:395) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the f uture, promise rejections that are not handled will terminate the Node.js process with a non-z ero exit code. 

```

**IOS (please complete the following information):**
- iOS Version 13.4.1
- Device: iPad Pro (2018)
- Homebridge Version: 1.1.0
- Homebridge Harmony Version: 1.3.8
