chore: fix typing on refresh

Author: allenporter

roborock/devices/traits/v1/device_features.py

@@ -27,12 +27,12 @@ async def refresh(self) -> Self:
         cache_data = await self._cache.get()
         if cache_data.device_features is not None:
             self._update_trait_values(cache_data.device_features)
-            return cache_data.device_features  # type: ignore[return-value]
+            return self
         # Save cached device features
         device_features = await super().refresh()
         cache_data.device_features = device_features
         await self._cache.set(cache_data)
-        return device_features  # type: ignore[return-value]
+        return device_features
 
     def _parse_response(self, response: common.V1ResponseData) -> DeviceFeatures:
         """Parse the response from the device into a MapContentTrait instance."""