Fix integral action for AntiWindupStrategy::NONE (backport #432)

[mergify]

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

I fixed two other warning messages btw.

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This is an automatic backport of pull request #432 done by Mergify.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 76.63%. Comparing base (6d0482f) to head (2ea7d61).

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             @@
##            jazzy     #433      +/-   ##
==========================================
- Coverage   76.76%   76.63%   -0.14%     
==========================================
  Files          29       29              
  Lines        1945     1947       +2     
  Branches      114      114              
==========================================
- Hits         1493     1492       -1     
- Misses        379      383       +4     
+ Partials       73       72       -1     

Flag	Coverage Δ
unittests	76.63% <50.00%> (-0.14%)	⬇️

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%> (-1.89%)	⬇️
control_toolbox/src/pid.cpp	71.50% <66.66%> (-0.24%)	⬇️

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