RGBWW lightbulb: use correct value for colour mode

HA uses hs not hsv

Issue #996

custom_components/tuya_local/devices/rgbww_lightbulb.yaml

@@ -16,7 +16,7 @@ primary_entity:
         - dps_val: white
           value: color_temp
         - dps_val: colour
-          value: hsv
+          value: hs
     - id: 3
       type: integer
       name: brightness