Fix supported_features in Ecovacs vacuum (#69906)

* Revert _attr_supported_features from Ecovacs

* Override supported_features property

* Remove space

homeassistant/components/ecovacs/vacuum.py

@@ -111,6 +111,11 @@ class EcovacsVacuum(VacuumEntity):
         """Return the name of the device."""
         return self._name
 
+    @property
+    def supported_features(self) -> int:
+        """Flag vacuum cleaner features that are supported."""
+        return self._attr_supported_features
+
     @property
     def status(self):
         """Return the status of the vacuum cleaner."""