fix(madimack_elitev4_heatpump): ignore device flag for displaying power

The power seems to give valid values even when this is reporting false.
The purpose does not seem to be as a feature flag.

Issue #5590

custom_components/tuya_local/devices/madimack_elitev4_heatpump.yaml

@@ -248,7 +248,6 @@ entities:
         name: overclock_mode
   - entity: sensor
     class: power
-    hidden: unavailable
     category: diagnostic
     dps:
       - id: 125
@@ -261,7 +260,7 @@ entities:
           - scale: 1000
       - id: 122
         type: boolean
-        name: available
+        name: display
   - entity: lock
     translation_key: child_lock
     category: config