Shinco 30D: make compatible with 50D also.

50D appears to be mostly the same, just missing the Ionizer.
PR #1748

custom_components/tuya_local/devices/shinco_30d_dehumidifier.yaml

@@ -60,6 +60,7 @@ secondary_entities:
       - id: 5
         type: boolean
         name: switch
+        optional: true
   - entity: lock
     translation_key: child_lock
     category: config