Switch used to trigger Motion Detection Snapshots (Rich Notifications) doesn't reset automatically.
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**Describe The Bug:**
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Hi @normen  So, I noticed this since we had the doorbell function added to this plugin. When doorbell function is enabled for any of the cameras in the config, the switch used to trigger snapshots (rich notifications), doesn't reset automatically. In the logs tho it says resetting switch to false, but the switch state doesn't actually change, it stays on.
**To Reproduce:**
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Just have doorbell flag enabled for one of the cameras and turn the snapshot switch on, it will stay on.
**Expected behavior:**
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Expected behavior, is that the switch should reset automatically after being turned on. If the doorbell flag isn't enabled the switch works as expected.
**Logs:**
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```
[5/28/2020, 17:59:20] [Camera-ffmpeg] Setting Entrance Camera Motion to true
[5/28/2020, 17:59:20] [Camera-ffmpeg] Setting Entrance Camera Motion to false
```

**Homebridge Config:**

```json
                {
                    "name": "Entrance Camera",
                    "uploader": true,
                    "motion": true,
                    "doorbell": true,
                    "videoConfig": {
                        "source": "-rtsp_transport udp -i rtsp://login:password@ip:port/udp/av0_0",
                        "stillImageSource": "-i http://ip/img/snapshot.cgi?user=user&pwd=pwd&res=0",
                        "maxFPS": 25,
                        "vcodec": "copy",
                        "audio": true,
                        "debug": false
                    }
```

**Screenshots:**
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**Environment:**

* **Node.js Version**: <!-- node -v -->
12.16.2
* **NPM Version**: <!-- npm -v -->
6.14.4
* **Homebridge Version**: <!-- homebridge -V -->
1.1.0
* **Homebridge Camera FFmpeg Version**: 1.2.0
* **Homebridge Config UI X Plugin Version**: 4.21.0
* **Operating System**:  Raspbian 


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