Current Temperature NaN
<!-- You must use the issue template below when submitting a bug -->

**Describe The Bug:**
Temperature error in logs, not accurately displayed in HomeKit.

**To Reproduce:**
Happens consistently in my HomeBridge instance.

**Expected behavior:**
Accurate temperature information for refrigerator and freezer.

**Logs:**

[8/30/2021, 10:19:13 PM] [homebridge-lg-thinq] This plugin generated a warning from the characteristic 'Current Temperature': characteristic value expected valid finite number and received "NaN" (number). See https://git.io/JtMGR for more info.
[8/30/2021, 10:19:13 PM] [homebridge-lg-thinq] Error: 
    at CurrentTemperature.Characteristic.characteristicWarning (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:2038:105)
    at CurrentTemperature.Characteristic.validateUserInput (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1931:16)
    at CurrentTemperature.Characteristic.updateValue (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1379:20)
    at Thermostat.Service.updateCharacteristic (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Service.ts:465:35)
    at Refrigerator.updateAccessoryCharacteristic (/homebridge/node_modules/homebridge-lg-thinq/src/devices/Refrigerator.ts:82:24)
    at EventEmitter.emit (events.js:400:28)
    at /homebridge/node_modules/homebridge-lg-thinq/src/platform.ts:167:25
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)

**Plugin Config:**

"username": "XXX",
            "password": "XXX",
            "country": "US",
            "language": "en-US",
            "thinq1": true,
            "washer_trigger": false,
            "platform": "LGThinQ",
            "auth_mode": "token",
            "refresh_token": "XXX",
            "devices": [
                {
                    "id": "XXX",
                    "name": "Refrigerator",
                    "type": "REFRIGERATOR",
                    "ac_mode": "BOTH",
                    "ac_swing_mode": "BOTH",
                    "ac_temperature_sensor": false,
                    "ac_led_control": false,
                    "ac_fan_control": false
                }
            ],
            "refresh_interval": 15,

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

**Environment:**

* **Plugin Version**: homebridge-lg-thinq v1.1.2
* **Homebridge Version**: v1.3.4
* **Node.js Version**: v14.17.5
* **NPM Version**: v6.14.14
* **Operating System**: Docker

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