have moveit_planners depend on chomp (#3015)

by default, the packages generated by moveit_setup_assistant now
include a chomp configuration - but do not depend on chomp. the
packages do depend on moveit_planners, so it makes sense to include
chomp here.

moveit_planners/moveit_planners/package.xml

@@ -19,10 +19,7 @@
 
   <buildtool_depend>ament_cmake</buildtool_depend>
 
-  <!--
   <exec_depend>chomp_motion_planner</exec_depend>
-  <exec_depend>moveit_planners_chomp</exec_depend>
-  -->
   <exec_depend>moveit_planners_ompl</exec_depend>
   <exec_depend>moveit_planners_stomp</exec_depend>
   <exec_depend>pilz_industrial_motion_planner</exec_depend>