QH GD heater: remove dupicate units

Accidentally added in previous bulk change, but wasn't needed for this file.

custom_components/tuya_local/devices/qh_gd_elegant_heater.yaml

@@ -21,7 +21,6 @@ primary_entity:
       range:
         min: 10
         max: 45
-      unit: C
     - id: 3
       type: integer
       name: current_temperature