Feit light RGB: avoid null mapping from being used in reverse

custom_components/tuya_local/devices/feit_light_rgb_bulb.yaml

@@ -19,6 +19,7 @@ primary_entity:
           value: hs
         - dps_val: null
           value: color_temp
+          hidden: true
     - id: 3
       type: integer
       name: brightness