* Use f-strings in integrations starting with "M"
* Format mqtt light init with black
* Fix lint error
* Fix pylint error
* Restore constants
* Update homeassistant/components/mqtt/discovery.py
* Update homeassistant/components/mqtt/discovery.py
* Update homeassistant/components/mqtt/discovery.py
* Update homeassistant/components/mqtt/discovery.py
* Format with Black