Update custom_components/tuya_local/devices/vta+_fan_heater

Added ` hidden: true`  to dps_val: "null", as preset_mode condition for hvac_mode

custom_components/tuya_local/devices/vta+_fan_heater

@@ -17,6 +17,7 @@ primary_entity:
           conditions:
             - dps_val: "null"
               value: fan_only
+              hidden: true
             - dps_val: "level_1"
               value: fan_only
             - dps_val: "level_2"