ROS msgs: remove redundant step

Jenkinsfile

@@ -481,12 +481,10 @@ pipeline {
             sh('export')
             withCredentials([usernamePassword(credentialsId: 'px4buildbot_github_personal_token', passwordVariable: 'GIT_PASS', usernameVariable: 'GIT_USER')]) {
               sh('git clone https://${GIT_USER}:${GIT_PASS}@github.com/PX4/px4_msgs.git')
-              sh('python msg/tools/uorb_to_ros_msgs.py msg/ msg/ros/')
-              sh('cp -a msg/ros/. px4_msgs/msg')
+              sh('python msg/tools/uorb_to_ros_msgs.py msg/ px4_msgs/msg/')
               sh('cd px4_msgs; git status; git add .; git commit -a -m "Update message definitions `date`" || true')
               sh('cd px4_msgs; git push origin master || true')
               sh('rm -rf px4_msgs')
-              sh('rm -rf msg/ros')
             }
           }
           when {