[PidROS] Change args to const reference

[saikishor]

Change the constructor args to const ref instead of a copy

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.35%. Comparing base (9b8eef6) to head (018d91a).

Additional details and impacted files

@@             Coverage Diff              @@
##           ros2-master     #513   +/-   ##
============================================
  Coverage        82.35%   82.35%           
============================================
  Files               29       29           
  Lines             1984     1984           
  Branches           114      114           
============================================
  Hits              1634     1634           
  Misses             281      281           
  Partials            69       69           

Flag	Coverage Δ
unittests	82.35% <ø> (ø)

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Files with missing lines	Coverage Δ
...ontrol_toolbox/include/control_toolbox/pid_ros.hpp	100.00% <ø> (ø)

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[christophfroehlich]

LGTM