Remove unused function in Servo

[henningkayser]

This lonely function declaration is useless, let's remove it.

[codecov]

Codecov Report

Base: 50.99% // Head: 50.95% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (5bcf8c8) compared to base (e6ac060).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1709      +/-   ##
==========================================
- Coverage   50.99%   50.95%   -0.03%     
==========================================
  Files         378      378              
  Lines       31649    31649              
==========================================
- Hits        16135    16125      -10     
- Misses      15514    15524      +10     

Impacted Files	Coverage Δ
...dl_kinematics_plugin/src/kdl_kinematics_plugin.cpp	76.52% <0.00%> (-2.27%)	⬇️
...nning_scene_monitor/src/planning_scene_monitor.cpp	45.29% <0.00%> (-0.43%)	⬇️

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