Update ustellar_ut99911_rgb.yaml

Correct typo

custom_components/tuya_local/devices/ustellar_ut99911_rgb.yaml

@@ -67,7 +67,7 @@ entities:
             value: GBR
           - dps_val: 5
             value: BRG
-          - dps_val: 5
+          - dps_val: 6
             value: BGR
   - entity: select
     name: Music