L2SS-769: Remove reference to non-existing member

tangostationcontrol/tangostationcontrol/devices/beam_device.py

@@ -328,7 +328,7 @@ class BeamTracker():
             return
 
         self.done = False
-        self.thread = Thread(target=self._update_pointing_direction, name=f"BeamTracker of {self.device.get_name()}")
+        self.thread = Thread(target=self._update_pointing_direction, name="BeamTracker")
         self.thread.start()
 
         logger.info("BeamTracking thread started")