fix: drop model sensor

It's not working as actual model.

custom_components/tuya_local/devices/ballu_aura.yaml

@@ -95,11 +95,3 @@ secondary_entities:
       - id: 106
         name: sensor
         type: integer
-  - entity: sensor
-    category: diagnostic
-    name: model
-    hidden: true
-    dps:
-      - id: 110
-        name: sensor
-        type: string