Defining more than 3 inputs doesn't work
Hi there,

I just updated my config to use "platform" and looked over my config. So I added another HDMI to my inputs:

```
                    "inputs": [
                        {
                            "appId": "com.webos.app.livetv",
                            "name": "Live TV"
                        },
                        {
                            "appId": "com.webos.app.hdmi2",
                            "name": "XBOX"
                        },
                        {
                            "appId": "netflix",
                            "name": "Netflix"
                        },
                        {
                            "appId": "com.webos.app.hdmi3",
                            "name": "Apple TV"
                        }
                    ],
```

I saved the config and restarted Homebridge but the newly added "Apple TV" is not showing up. I changed the order of the inputs and it seems like only 3 inputs are shown in Apple's Home App.
Can anyone confirm this issue?

Best regards 
Sascha