Privacy mode is not working 
**Describe the bug**
I've enabled the Privacy Switch for one of my cameras (a Tapo TC70) but when I enable the switch nothing happens.  I see this was raised and closed in #430 but I don't know where to find the "At Home" setting or switch.

**To Reproduce**
As per above

**Expected behavior**
I would expect some plugin-generated image to appear rather than the camera's RTSP stream

**Logs**
N/A

**Screenshots**
N/A

**Environment**
- Node.js Version: v16.14.2
- Homebridge Version: v1.4.0
- Camera UI Version: v5.0.19
- Operating System: MacOS Big Sur
- Browser: Safari 
