Alecoair Home: Ionizer seems to be always available.

All the logs submitted on #328 and #397 show this as available, so it need not
be marked as optional.

custom_components/tuya_local/devices/alecoair_d12_home_dehumidifier.yaml

@@ -51,7 +51,6 @@ secondary_entities:
       - id: 5
         type: boolean
         name: switch
-        optional: true
   - entity: fan
     dps:
       - id: 1