Add missing dependency

Author: hilary-luo

clearpath_sensors/package.xml

@@ -28,6 +28,7 @@
   <exec_depend>phidgets_spatial</exec_depend>
   <exec_depend>realsense2_camera</exec_depend>
   <exec_depend>spinnaker_camera_driver</exec_depend>
+  <exec_depend>topic_tools</exec_depend>
   <exec_depend>umx_driver</exec_depend>
   <exec_depend>urg_node</exec_depend>
   <exec_depend>velodyne_driver</exec_depend>