fix(madimack_elite_v3_heatpump): fix child lock availability

custom_components/tuya_local/devices/madimack_elite_v3_heatpump.yaml

@@ -236,6 +236,7 @@ entities:
       - id: 3
         type: boolean
         optional: true
+        name: available
         mapping:
           - dps_val: null
             value: false