Update de_web_plugin.cpp
Update de_web_plugin.cpp

Whitelist `Halo_RL5601` for colour temperature, see #3509.

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