Fix problems of roundings in the cvpImageCircle::omputeAngularCoverageInRoI

[rolalaro]

A rouding problem was introduced by the use of M_PIf .
The result of the method is now ensured to be between 0 and 2 Pi.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (fa84fee) 54.38% compared to head (084d1b8) 54.37%.

❗ Current head 084d1b8 differs from pull request most recent head e03dfe3. Consider uploading reports for the commit e03dfe3 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1268      +/-   ##
==========================================
- Coverage   54.38%   54.37%   -0.01%     
==========================================
  Files         400      400              
  Lines       50486    50503      +17     
==========================================
+ Hits        27456    27461       +5     
- Misses      23030    23042      +12     

Files	Coverage Δ
modules/core/include/visp3/core/vpImageCircle.h	50.00% <100.00%> (+50.00%)	⬆️
modules/core/include/visp3/core/vpMath.h	92.10% <100.00%> (+0.43%)	⬆️
modules/core/src/image/vpImageCircle.cpp	92.19% <90.00%> (-0.23%)	⬇️

... and 2 files with indirect coverage changes

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