Fix whitespaces

Author: urfeex

ur_controllers/package.xml

@@ -41,7 +41,7 @@
   <depend>control_msgs</depend>
   <depend>trajectory_msgs</depend>
   <depend>action_msgs</depend>
-  
+
   <test_depend>controller_manager</test_depend>
   <test_depend>ros2_control_test_assets</test_depend>