homebridge-camera-ffmpeg v2.4.4 ability to call camera snapshot gone
<!-- You must use the issue template below -->

**Describe The Problem:**
<!-- A clear and concise description of what the bug is. -->
upgraded tonight to look at adding some external motion detectors via mqtt (camerevents)

but after adding the motion device, i was trying to set up a take snap shot on motion detection, but i cant call the camera  now for an action.

I was able to do this previously, as id actually been triggering an image on garage door open.


**To Reproduce:**
<!-- Steps to reproduce the behavior. -->
new autonation
on motion detection sensor
next
choose action, stuck here.


```json
Show your homebridge config.json here.
Remove any sensitive information, such as your homebridge-gsh / google-smarthome token.
```

```
"name": "Camera ffmpeg",
            "mqtt": "mqt,
            "topic": "CameraEvents/+/event",
            "cameras": [
                {
                    "name": "Backdoor",
                    "manufacturer": "Dahua",
                    "motion": false,
                    "switches": true,
                    "videoConfig": {
                        "source": "-re -i rtsp://IOS:password@cam-nvr554/cam/realmonitor?channel=2&subtype=1",
                        "stillImageSource": "-i http://IOS:password@cam-nvr/cgi-bin/snapshot.cgi?channel=2",
                        "maxStreams": 1,
                        "maxFPS": 10,
                        "maxBitrate": 300,
                        "vcodec": "libx264",
                        "audio": false,
                        "debug": false
                    }
                },

```

only a partial config.  camera works for automTic snapshot and live.

**Screenshots:**
<!-- If applicable, add screenshots to help explain your problem. -->

**Environment:**
docker on ubuntu.

* **Node.js Version**: <!-- node -v -->
* **NPM Version**: <!-- npm -v -->
* **Homebridge Version**: <!-- homebridge -V -->
* **Homebridge Camera FFmpeg Version**:
* **Homebridge Config UI X Plugin Version**:
* **Operating System**: <!-- Raspbian / Ubuntu / Debian / Windows / macOS / Docker -->


<!-- Click the "Preview" tab before you submit to ensure the formatting is correct. -->
