GravityCompensation: Use the FilterTest fixture (backport #439)

[mergify]

I applied the same changes of #261 to the GravityCompensation filter test. Fixes #385

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This is an automatic backport of pull request #439 done by Mergify.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.13%. Comparing base (862d687) to head (0011909).

Additional details and impacted files

@@            Coverage Diff             @@
##            jazzy     #446      +/-   ##
==========================================
- Coverage   76.23%   76.13%   -0.11%     
==========================================
  Files          29       28       -1     
  Lines        2066     2053      -13     
  Branches      125      127       +2     
==========================================
- Hits         1575     1563      -12     
  Misses        420      420              
+ Partials       71       70       -1     

Flag	Coverage Δ
unittests	76.13% <100.00%> (-0.11%)	⬇️

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Files with missing lines	Coverage Δ
...test/control_filters/test_gravity_compensation.cpp	100.00% <100.00%> (ø)

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