Update rest_sensors.cpp
Update rest_sensors.cpp

Bug fix: someitmes updated `config.heatsetpoint` isn't sent to Eurotronic Spirit.

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