[FIX] renaming of design matrix images at group level

[Remi-Gau]

fix #667

[codecov]

Codecov Report

Merging #668 (6eaa0e6) into main (3b19c9b) will decrease coverage by 0.02%.
The diff coverage is 73.33%.

@@            Coverage Diff             @@
##             main     #668      +/-   ##
==========================================
- Coverage   76.29%   76.27%   -0.03%     
==========================================
  Files         210      211       +1     
  Lines        5367     5404      +37     
==========================================
+ Hits         4095     4122      +27     
- Misses       1272     1282      +10     

Flag	Coverage Δ
unittests	76.27% <73.33%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/messages/errorHandling.m	100.00% <ø> (ø)
src/utils/designMatrixFigureName.m	100.00% <ø> (ø)
src/workflows/stats/bidsResults.m	45.00% <ø> (+0.22%)	⬆️
src/workflows/stats/bidsRFX.m	84.37% <61.53%> (-4.92%)	⬇️
src/utils/renamePng.m	72.22% <64.28%> (-27.78%)	⬇️
src/infra/getRepoInfo.m	86.66% <86.66%> (ø)
src/infra/getEnvInfo.m	68.75% <100.00%> (+1.53%)	⬆️

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