Poolex Q-line: add mute mode.

Used fan_only for this, as it is really a weaker version of heat. Original submission was to use auto, but that has a specific meaning in HA that is not met.

Issue #166

custom_components/tuya_local/devices/poolex_qline_heatpump.yaml

@@ -17,6 +17,8 @@ primary_entity:
               value: cool
             - dps_val: heating
               value: heat
+            - dps_val: mute
+              value: fan_only
     - id: 2
       name: heating_mode
       hidden: true
@@ -27,6 +29,8 @@ primary_entity:
           icon: "mdi:hot-tub"
         - dps_val: cold
           icon: "mdi:snowflake"
+        - dps_val: mute
+          icon: "mdi:hot-tub"
     - id: 4
       name: temperature
       type: integer