Fix integral action for AntiWindupStrategy::NONE

[christophfroehlich]

There was no integral action with AntiWindupStrategy::NONE. Instead, it just should not saturate.

I fixed two other warning messages btw.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (ros2-master@c78e5e8). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
control_toolbox/include/control_toolbox/pid.hpp	0.00%	1 Missing ⚠️
control_toolbox/src/pid.cpp	66.66%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##             ros2-master     #432   +/-   ##
==============================================
  Coverage               ?   78.25%           
==============================================
  Files                  ?       30           
  Lines                  ?     1890           
  Branches               ?      114           
==============================================
  Hits                   ?     1479           
  Misses                 ?      342           
  Partials               ?       69           

Flag	Coverage Δ
unittests	78.25% <50.00%> (?)

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

Files with missing lines	Coverage Δ
control_toolbox/include/control_toolbox/pid.hpp	65.09% <0.00%> (ø)
control_toolbox/src/pid.cpp	74.54% <66.66%> (ø)

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