legacy-data: add missing _count

Author: bouwew

plugwise/legacy/data.py

@@ -84,6 +84,7 @@ def _climate_data(self, entity: GwEntityData, data: GwEntityData) -> None:
     def _get_anna_control_state(self, data: GwEntityData) -> None:
         """Set the thermostat control_state based on the opentherm/onoff device state."""
         data["control_state"] = "idle"
+        self._count += 1
         for entity in self.gw_entities.values():
             if entity["dev_class"] != "heater_central":
                 continue