Update rest_lights.cpp
Update rest_lights.cpp

- Send _Off with Effect_ to turn off Hue lights;
- Clear active colorloop when light is turned off.  Hue lights do so automatically, but others (e.g. GLEDOPTO) don't.

dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin