Camera with Doorbell not exposed correctly as a "Camera & Doorbell"
**Describe The Problem:**
Created a camera to act as a dummy Video Doorbell to use the doorbell trigger button exposed by this plugin. 

However the Video Doorbell is only recognised as a "Camera" only and not as a "Camera & Doorbell" in the Apple Home app. A plugin based off this called "homebridge-videodoorbell" correctly states the fake camera I setup as a "Camera & Doorbell" in the Apple Home app. I only switched to this main plugin to get the live feed of a still image to work.

The doorbell options like notification controls and chime controls are still exposed regardless.

**To Reproduce:**
Setup a camera, set "Enable Doorbell" in the automation options of the plugin Add camera via a child bridge and in Unbridged mode to the Apple Home app. Go to the Home settings, then Cameras & Doorbells. The added video doorbell is not reconsied as a "Camera & Doorbell", it's just a "Camera".

**Homebridge Config:**

```json
{
            "name": "Camera FFmpeg",
            "cameras": [
                {
                    "name": "Porch Doorbell",
                    "manufacturer": "Sunoo",
                    "model": "DIY",
                    "serialNumber": "V1D30D00RB3LL",
                    "firmwareRevision": "1.0.0",
                    "doorbell": true,
                    "switches": true,
                    "unbridge": true,
                    "videoConfig": {
                        "source": "-loop 1 -i /home/pi/Porch_Doorbell_Splash_Screen.jpg",
                        "stillImageSource": "-i /home/pi/Porch_Doorbell_Splash_Screen.jpg",
                        "maxFPS": 1
                    }
                }
            ],
            "platform": "Camera-ffmpeg",
            "_bridge": {
                "username": "<mac-address>",
                "port": <port-number>
            }
        }
```

**Environment:**

* **Node.js Version**: 18.15.0
* **NPM Version**: <!-- npm -v -->
* **Homebridge Version**: 1.6.0
* **Homebridge Camera FFmpeg Version**: 3.1.4
* **Homebridge Config UI X Plugin Version**: 4.50.2
* **Operating System**: Raspbian