Don't update production_log_refs when not required

Author: bouwew

plugwise_usb/nodes/helpers/pulses.py

@@ -700,8 +700,7 @@ def _update_log_references(self, address: int, slot: int) -> None:
         if is_consumption:
             self._update_first_consumption_log_reference(address, slot, log_time_stamp)
             self._update_last_consumption_log_reference(address, slot, log_time_stamp)
-        else:
-            # production
+        elif self._log_production:
             self._update_first_production_log_reference(address, slot, log_time_stamp)
             self._update_last_production_log_reference(address, slot, log_time_stamp)