[Bugfix] [jsk_pr2_startup] Remove a slash of the first character for noetic (tf2) in publish_empty_cloud.py #1562

Job	Run time
ros (indigo, jskrobotics/ros-ubuntu:14.04, false, true, jsk_robot_startup, echo 'ros-indigo-peppe...	25m 11s
ros (kinetic, jskrobotics/ros-ubuntu:16.04, false, true, wstool merge jsk_robot/jsk_fetch_robot/j...	27m 50s
ros (melodic, jskrobotics/ros-ubuntu:18.04, false, true, apt-get download ros-melodic-julius; wge...	32m 17s
ros (melodic, jskrobotics/ros-ubuntu:18.04, false, true, apt-get download ros-melodic-julius; wge...	37m 3s
ros (noetic, ubuntu:20.04, false, true, jsk_robot_startup, apt-get download ros-noetic-julius; wg...	41m 37s
	2h 43m 58s

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