Remove has_mean from suez_water external statistics (home-assistant#153986)

Author: emontnemery

homeassistant/components/suez_water/coordinator.py

@@ -241,7 +241,6 @@ def _get_statistics_metadata(
     ) -> StatisticMetaData:
         """Build statistics metadata for requested configuration."""
         return StatisticMetaData(
-            has_mean=False,
             mean_type=StatisticMeanType.NONE,
             has_sum=True,
             name=f"Suez water {name} {self._counter_id}",