'Brightness': characteristic value expected valid finite number and received "undefined" (undefined)
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# Bug Report

### Describe the Bug
<!-- ✍️edit: --> expected valid finite number and received "undefined"

### To Reproduce
Steps to reproduce the behavior:
 - Start Homebridge
 - Logs below show.

### Expected behavior
<!-- ✍️edit: --> A clear and concise description of what you expected to happen.


### Screenshots/Logs
<!-- ✍️edit: --> 
```
[9/20/2022, 11:22:06 PM] [homebridge-ring] This plugin generated a warning from the characteristic 'Brightness': characteristic value expected valid finite number and received "undefined" (undefined). See https://homebridge.io/w/JtMGR for more info.
[9/20/2022, 11:22:06 PM] [homebridge-ring] This plugin generated a warning from the characteristic 'Brightness': characteristic value expected valid finite number and received "undefined" (undefined). See https://homebridge.io/w/JtMGR for more info.
[9/20/2022, 11:22:06 PM] [homebridge-ring] This plugin generated a warning from the characteristic 'Brightness': characteristic value expected valid finite number and received "undefined" (undefined). See https://homebridge.io/w/JtMGR for more info.
```

### Additional context
<!-- ✍️edit: --> Add any other context about the problem here.

### Homebridge Ring Config
Post homebridge-ring platform config  _without sensitive information_
```
{
    "refreshToken": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
    "alarmOnEntryDelay": true,
    "hideLightGroups": true,
    "hideDoorbellSwitch": false,
    "hideCameraSirenSwitch": true,
    "hideInHomeDoorbellSwitch": true,
    "hideAlarmSirenSwitch": true,
    "hideUnsupportedServices": true,
    "ffmpegPath": "/usr/local/bin/ffmpeg",
    "avoidSnapshotBatteryDrain": false,
    "beamDurationSeconds": 32767,
    "debug": false,
    "unbridgeCameras": true,
    "cameraStatusPollingSeconds": 10,
    "locationModePollingSeconds": 10,
    "locationIds": [
        "xxxxx-xxxxx-x"
    ],
    "name": "Ring",
    "_bridge": {
        "name": "Ring Bridge",
        "username": "xx:xx:xx:xx:xx:xx",
        "port": xxxxx,
        "manufacturer": "Ring",
        "model": "Bridge"
    },
    "platform": "Ring"
}
```

### Environment
<!-- ✍️edit: -->
 - OS: macOS
 - Node.js: v16.17.0
 - homebridge-ring:  v11.2.1
 - homebridge: v1.5.1-beta.1
