MQTT payloads are not consistant. Sometimes "Open" instead of "open"
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**Describe The Problem:**
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when publishing MQTT command to garagedoor/get the payload returned on the myq/aabb11122233/garagedoor is proppercase capitalised. e.g. Open, Opening, Closed, Closing

When opening and closing the garage door regularly it send all lower case payloads eg. open, opening, closed, closing

line 175 in src/myq-garagedoor.ts is missing the .toLowerCase()

This causes problems for other subscribers to the mqtt topic which are expecting consistent payloads. 


**To Reproduce:**
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when publishing MQTT command to garagedoor/get the payload returned on the myq/aabb11122233/garagedoor is NOT proppercase capitalised. e.g. open, opening, closed, closing

**Logs:**
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**Homebridge Configuration:**

```json
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{
	"email": "xxxx@gmail.com",
	"password": "xxx111xxx111xxx111",
	"mqttTopic": "myq",
	"mqttUrl": "mqtt://xxx:xxxxx@10.0.0.36:1883",
	"platform": "myQ"
},
**Screenshots:**
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**Environment:**

System Information
Timezone	GMT-0400
OS	Ubuntu Focal Fossa (20.04.5 LTS)
Hostname	homebridge
IPv4 (eth0)	10.0.0.33
Node.js Version	v18.12.1
User	xxxx
Storage Path	/var/lib/homebridge
Config Path	/var/lib/homebridge/config.json
Plugin Path	/var/lib/homebridge/node_modules
Docker	Yes
Service Mode	Yes

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* **Node Version:** <!-- node -v -->
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