No need for the specialization of update()

[christophfroehlich]

@pedroazeredo04 was there a reason why we added the specialization of the update method, if it has the exact same code as the templated one? I don't see it..

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.77%. Comparing base (9b8eef6) to head (d7c04c2).

Additional details and impacted files

@@               Coverage Diff               @@
##           ros2-master     #509      +/-   ##
===============================================
+ Coverage        82.35%   82.77%   +0.41%     
===============================================
  Files               29       29              
  Lines             1984     1968      -16     
  Branches           114      111       -3     
===============================================
- Hits              1634     1629       -5     
+ Misses             281      273       -8     
+ Partials            69       66       -3     

Flag	Coverage Δ
unittests	82.77% <ø> (+0.41%)	⬆️

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Files with missing lines	Coverage Δ
...oolbox/include/control_filters/low_pass_filter.hpp	65.00% <ø> (+15.00%)	⬆️

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