[FIX] onsets and confounds are saved in the proper dir when there are several tasks

[Remi-Gau]

fixes #658

[codecov]

Codecov Report

Merging #659 (2029137) into main (22c150a) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #659      +/-   ##
==========================================
- Coverage   76.16%   76.15%   -0.01%     
==========================================
  Files         210      210              
  Lines        5350     5352       +2     
==========================================
+ Hits         4075     4076       +1     
- Misses       1275     1276       +1     

Flag	Coverage Δ
unittests	76.15% <100.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
src/workflows/stats/bidsFFX.m	75.71% <ø> (ø)
src/workflows/stats/bidsRFX.m	89.28% <ø> (ø)
src/batches/stats/setBatchFactorialDesign.m	92.39% <100.00%> (ø)
...rc/subject_level/createAndReturnCounfoundMatFile.m	75.00% <100.00%> (+1.66%)	⬆️
src/subject_level/createAndReturnOnsetFile.m	100.00% <100.00%> (ø)
src/utils/createGlmDirName.m	95.23% <0.00%> (-4.77%)	⬇️

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