fix(petsnowy_snowplus_catlitter): use correct unit for day

Issue #4927

custom_components/tuya_local/devices/petsnowy_snowplus_catlitter.yaml

@@ -177,7 +177,7 @@ entities:
       - id: 102
         name: sensor
         type: integer
-        unit: day
+        unit: d
   - entity: lock
     translation_key: child_lock
     category: config