Update light_node.cpp
Update light_node.cpp

- Support `state.alert` for IKEA FURTUR and KADRILJ and Aqara E1;
- No `state.alert` for mains-powered Aqara Curtain Motor, nor for Aqara B1

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