No Audio In Child Bridge
# Bug Report

### Describe the Bug
I updated my Homebridge installation to 1.3.0 Beta, because the new 'Child Bridge' feature was too important for me to wait for. I moved the Ring plugin to it's own child bridge, and readded it to Homekit. It adds correctly, and video functions (albeit a bit stuttery). Tile screenshot also updates correctly. The only problem I'm facing is that I'm not getting any sound.

### To Reproduce
Move Ring plugin to Child Bridge

### Expected behavior
Get Sound/Voice and no video stutter as when child bridge is disabled.


### Screenshots/Logs

![ring1](https://user-images.githubusercontent.com/63603736/107477229-acd73f80-6b77-11eb-85fe-2cf94a9d268a.PNG)


### Environment
<!-- ✍️edit: -->
 - OS: Raspbian GNU/Linux Buster (10)
 - Node.js: 14.15.4
 - NPM: 6.14.10
 - homebridge-ring: 9.14.2
 - homebridge: 1.3.0-beta.54
