[BUG] Input set in a scene is ignored, and main activity is turned on
**Describe the bug**
I have created a scene in the Apple Home app to turn on my TV accessory and set the input to a secondary input (not the main activity). When I perform the scene, the TV is turned on to the main activity instead.

**To Reproduce**

1. Set a scene to turn on the TV and select an input that isn't the main activity.
1. While the TV is off, perform the scene.

**Expected behavior**
The TV is turned on using the selected input with the corresponding Harmony activity.

**iOS**
- Version 12.4
- Device: iPhone 6s

**Config**
```
{
    "platform": "HarmonyHubWebSocket",
    "name": "Harmony Hub",
    "hubIP": "192.168.2.2",
    "showTurnOffActivity": false,
    "publishSwitchActivitiesAsIndividualAccessories": true,
    "publishDevicesAsIndividualAccessories": true,
    "publishHomeControlsAsIndividualAccessories": true,
    "mainActivity": "Watch Apple TV"
}
```