* Fix MQTT Light with RGB and Brightness When an MQTT light is given an RGB and Brightness topic, the RGB is scaled by the brightness *as well* as the brightness being set This causes 255,0,0 at 50% brightness to be sent as 127,0,0 at 50% brightness, which ends up as 63,0,0 after the RGB bulb has applied its brightness scaling. Fixes the same issue in mqtt, mqtt-json and mqtt-template. Related Issue: #13725 * Add comment to mqtt_json as well