Fix the servo executable name

[AndyZe]

Fix the Servo executable name which changed in #649. You can verify by checking moveit_servo/CMakeLists.

This gets the tutorial back to a working state for the main branch of MoveIt2.

[codecov]

Codecov Report

Merging #746 (5e266c0) into main (bbcf9a0) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #746      +/-   ##
==========================================
+ Coverage   54.24%   54.24%   +0.01%     
==========================================
  Files         192      192              
  Lines       20230    20230              
==========================================
+ Hits        10971    10972       +1     
+ Misses       9259     9258       -1     

Impacted Files	Coverage Δ
...dl_kinematics_plugin/src/kdl_kinematics_plugin.cpp	74.72% <0.00%> (-1.13%)	⬇️
...nning_scene_monitor/src/planning_scene_monitor.cpp	45.82% <0.00%> (+0.51%)	⬆️

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[henningkayser]

Good catch