Rotenso heatpump: add name to fault sensor.

Fault sensor was unnamed.  It isn't clear what it is for without a name.

custom_components/tuya_local/devices/rotenso_ronir35wi_heatpump.yaml

@@ -124,6 +124,7 @@ secondary_entities:
         type: boolean
         name: switch
   - entity: binary_sensor
+    name: Fault
     class: problem
     category: diagnostic
     dps: