When adding accessories or updating homebridge, ring accessories move back to "default" room
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# Bug Report

### Describe the Bug
If I add new sensors to ring or update the plugin I very often have my ring accessories all default back to the default room, breaking automations and causing me to have to reassign dozens of devices.

### To Reproduce
Steps to reproduce the behavior:
Add device in ring.
Restart homebridge

### Expected behavior
Only new devices should be in "default" room

### Screenshots/Logs
<!-- ✍️edit: --> If applicable, add screenshots and log output to help explain your problem.

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

### Homebridge Ring Config
Post homebridge-ring platform config  _without sensitive information_
```
  {
      "refreshToken": "xxxxxxxx",
      "debug": false,
      "cameraStatusPollingSeconds": 30,
      "platform": "Ring"
  },
```

### Environment
<!-- ✍️edit: -->
 - OS: Raspbian GNU/Linux Buster (10) 
 - Node.js:v14.15.3
 - NPM: 6.14.9
 - homebridge-ring: homebridge-ring v9.14.1 
 - homebridge: Homebridge v1.2.5
 - hoobs: na
