Revert "Don't update PID on keep_alive timer."

This reverts commit 50f79dd.

Author: ScratMan

custom_components/smart_thermostat/climate.py

@@ -716,7 +716,7 @@ async def _async_control_heating(self, time_func=None, calc_pid=False):
                 await self.async_update_ha_state()
                 return
 
-            if calc_pid:
+            if calc_pid or self._sampling_period != 0:
                 await self.calc_output()
             if time.time() - self._last_sensor_update > 10800:
                 # sensor not updated for more than 3 hours, considered as stall, set to 0 for safety