Update smart_wifi_socket_Thermostat.yaml

Brightness middle level renamed to Medium

custom_components/tuya_local/devices/smart_wifi_socket_Thermostat.yaml

@@ -259,6 +259,6 @@ secondary_entities:
           - dps_val: "Low"
             value: "Low"
           - dps_val: "Middle"
-            value: "Middle"
+            value: "Medium"
           - dps_val: "High"
             value: "High"