fix: stopping during turn sets speed after turn has finished

uppaal2jetracer/jetracerros2/jetracerros2/jetracer_controller.py

@@ -98,7 +98,8 @@ class JetRacerController(Node):
         time.sleep(turn_time)
 
         self._steering_angle = 0.0
-        self._speed = old_speed
+        if self._speed != 0.0:
+            self._speed = old_speed
 
         self._publish_to_cmd_vel()