329d50865a
use official unit of measure for Lux in wiffi component
Add a mapping for the wiffi unit of illuminance 'lux' to the Home Assistant unit 'lx'. This fixed the following warning during startup:
```
2023-02-04 10:28:30.653 WARNING (MainThread) [homeassistant.components.sensor] Entity sensor.helligkeit (<class 'homeassistant.components.wiffi.sensor.NumberEntity'>) is using native unit of measurement 'lux' which is not a valid unit for the device class ('illuminance') it is using; expected one of ['lx']; Please update your configuration if your entity is manually configured, otherwise create a bug report at https://github.com/home-assistant/core/issues?q=is%3Aopen+is%3Aissue+label%3A%22integration%3A+wiffi%22
```
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