hanyi.airpurifier.kj550 temperature doesn't work.
**Describe the bug**
_A clear and concise description of what the bug is._

Add the hanyi.airpurifier.kj550 done
but in my iPhone Home kit,

temperature is just 0.
(But My another Mi air 2 is well)

**Expected behavior**
_A clear and concise description of what you expected to happen._

**Your config.json**
_Provide the config.json entry for your device._

"platforms": [
        {
            "name": "Config",
            "port": 8581,
            "platform": "config"
        },
        {
            "devices": [
                {
                    "name": "Mi whole",
                    "ip": "192.168.0.xx",
                    "token": "613xxxxxxxxxxxxxxxxxxxxxxxxxxx",
                    "deviceId": "xxxxxxxxx",
                    "model": "hanyi.airpurifier.kj550",
                    "pollingInterval": 10,
                    "deepDebugLog": false,
                    "buzzerControl": false,
                    "ledControl": false,
                    "childLockControl": false,
                    "modeControl": false
                }
            ],
            "platform": "miot"
        }
    ],

**Debug log**
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**Screenshots**
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**Additional context**
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