[FIX] Fix the way the voxel size is computed

[Remi-Gau]

fixes #1052
closes #1047

[codecov]

Codecov Report

Attention: Patch coverage is 7.14286% with 26 lines in your changes missing coverage. Please review.

Project coverage is 79.62%. Comparing base (7d52979) to head (d47efa0).
Report is 187 commits behind head on main.

Files with missing lines	Patch %	Lines
src/workflows/bidsCheckVoxelSize.m	0.00%	26 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1053      +/-   ##
==========================================
- Coverage   79.95%   79.62%   -0.33%     
==========================================
  Files         244      246       +2     
  Lines        6655     6691      +36     
  Branches       40       40              
==========================================
+ Hits         5321     5328       +7     
- Misses       1318     1347      +29     
  Partials       16       16              

Flag	Coverage Δ
cli	38.99% <ø> (ø)
macos-latest_matlab-R2022b	80.87% <7.14%> (-0.35%)	⬇️
octave	76.78% <7.14%> (-0.34%)	⬇️
ubuntu-latest_matlab-R2022b	81.04% <7.14%> (-0.35%)	⬇️

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