Fan speeds bug
**Describe the bug**
Siri always set my fan speed a step higher; when I ask Siri to set the fan speed to 25%, it set it to 50%, and when I ask Siri to set the fan speed to 50%, it set it to 75% and so on.

**Expected behavior**
The fan has 4 speeds, it should be set to level 1 speed when I ask Siri to set the fan speed to 25%, level 2 speed 50%, and so on.

**Your config.json**

                {
                    "name": "The Standing Fan",
                    "ip": "192.168.0.38",
                    "token": "847f49d3ed46aabcc6edda4b8c1c15c5",
                    "micloud": {
                        "username": "uswong@gmail.com",
                        "password": "xxxxxxxxxxx",
                        "country": "cn",
                        "forceMiCloud": true
                    }
                }
 
I named it `The Standing fan`. the model of the fan is `zhimi.fan.sa1`

**Debug log**
_Provide a snippet of a debug log when the issue occurs. Ideally with the `deepDebugLog` property enabled._

**Screenshots**
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**Additional context**
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