Fix a parameter switch in moveit_cpp loading

[AndyZe]

A simple bug fix. Caught by @mechwiz

[henningkayser]

wow, thanks for fixing!

[codecov]

Codecov Report

Merging #2187 into master will increase coverage by 0.32%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2187      +/-   ##
==========================================
+ Coverage   57.61%   57.93%   +0.32%     
==========================================
  Files         327      327              
  Lines       24923    25677     +754     
==========================================
+ Hits        14359    14876     +517     
- Misses      10564    10801     +237     

Impacted Files	Coverage Δ
...cpp/include/moveit/moveit_cpp/planning_component.h	100.00% <100.00%> (ø)
...eit/planning_scene_monitor/current_state_monitor.h	50.00% <0.00%> (-50.00%)	⬇️
...nning_scene_monitor/src/planning_scene_monitor.cpp	70.10% <0.00%> (-29.90%)	⬇️
.../ompl_interface/src/detail/constrained_sampler.cpp	46.15% <0.00%> (-17.95%)	⬇️
...g_scene_interface/src/planning_scene_interface.cpp	51.51% <0.00%> (-3.28%)	⬇️
...meterization/work_space/pose_model_state_space.cpp	82.31% <0.00%> (-0.69%)	⬇️
...it/planning_scene_monitor/planning_scene_monitor.h	91.30% <0.00%> (+0.39%)	⬆️
...ipulation/pick_place/src/manipulation_pipeline.cpp	77.35% <0.00%> (+0.94%)	⬆️
...anning_scene_monitor/src/current_state_monitor.cpp	52.82% <0.00%> (+1.53%)	⬆️
moveit_ros/moveit_servo/src/servo_calcs.cpp	73.70% <0.00%> (+3.52%)	⬆️

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[v4hn]

This definitely should be part of melodic-devel before the release.