fixed on_set_chained_mode implementations to avoid cpplint warnings

[bhagyeshagresar]

Fixed warnings generated by cpplint/cpplint#131 on some of the controllers that implement the chained mode.

[bmagyar]

A moor reference isn't really adhering to cppkint standards ;)

[bmagyar]

You can achieve the same by commenting out the name of the argument. It tricks the parser and also the compiler. We already use that approach in the codebase, just look for "/*" in ros2_control

[christophfroehlich]

No, I don't think so. See #1491 and the linked cpplint issue.

[bmagyar]

Thank you for the contribution! Great that you found out this. Please take a look at the solution I recommended.

[bmagyar]

You can achieve the same by commenting out the name of the argument. It tricks the parser and also the compiler. We already use that approach in the codebase, just look for "/*" in ros2_control

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.61%. Comparing base (0095ef1) to head (6538cfc).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1564   +/-   ##
=======================================
  Coverage   85.60%   85.61%           
=======================================
  Files         123      123           
  Lines       11873    11860   -13     
  Branches     1016     1015    -1     
=======================================
- Hits        10164    10154   -10     
+ Misses       1384     1383    -1     
+ Partials      325      323    -2     

Flag	Coverage Δ
unittests	85.61% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...iff_drive_controller/src/diff_drive_controller.cpp	81.29% <100.00%> (-0.07%)	⬇️
..._drive_controller/src/mecanum_drive_controller.cpp	90.68% <100.00%> (-0.04%)	⬇️
pid_controller/src/pid_controller.cpp	72.08% <100.00%> (-0.12%)	⬇️
...llers_library/src/steering_controllers_library.cpp	70.37% <100.00%> (-0.11%)	⬇️

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