Doorbell MQTT settings not availible in UI
**Describe the bug**
The settings to setup the doorbell MQTT topics are not available in the UI settings page.

**To Reproduce**
Try to setup MQTT settings for doorbell actions.

**Expected behavior**
Like MQTT motion should be a dialog to setup MQTT doorbell (see previous camera-ui versions)

**Screenshots**
![Screenshot 2022-02-03 at 16 03 17](https://user-images.githubusercontent.com/1226390/152368884-f7c3105f-4879-497d-a2fd-54d19fce63ed.png)

![Screenshot 2022-02-03 at 16 04 40](https://user-images.githubusercontent.com/1226390/152369433-45410bbd-66f8-4dcf-bd64-5d40a496eb30.png)


**Environment**
- Node.js Version: v14.19.0
- Homebridge Version: v1.4
- Camera UI Version: v5.0.16
- Operating System: raspbian buster
- Browser: FF
