Ditua diffuser: correct typo in secondary_entities

Secondary entities were not showing due to wrong spelling.

Issue #627

custom_components/tuya_local/devices/ditua_dt1522yn_aromadiffuser.yaml

@@ -17,7 +17,7 @@ primary_entity:
           value: 50
         - dps_val: large
           value: 100
-secondary_entites:
+secondary_entities:
   - entity: light
     name: LED
     category: config