Update rest_lights.cpp
Update rest_lights.cpp

Fix setting `state.on` for Aqara B1, see #1654.

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