Update light_node.cpp
Update light_node.cpp

Bug fix: whitelist to suppress `state.bri` for on/off plugs with _Level_ cluster was ignored.  See #1444.

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