[FIX] use proper subject background for montage

[Remi-Gau]

fixes #645

[Remi-Gau]

@marcobarilari this should fix the background image issue

[codecov]

Codecov Report

Merging #656 (8cf3a67) into main (cf8bc73) will increase coverage by 0.18%.
The diff coverage is 63.63%.

@@            Coverage Diff             @@
##             main     #656      +/-   ##
==========================================
+ Coverage   75.92%   76.10%   +0.18%     
==========================================
  Files         210      210              
  Lines        5317     5345      +28     
==========================================
+ Hits         4037     4068      +31     
+ Misses       1280     1277       -3     

Flag	Coverage Δ
unittests	76.10% <63.63%> (+0.18%)	⬆️

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

Impacted Files	Coverage Δ
src/workflows/stats/bidsResults.m	44.32% <63.63%> (-0.06%)	⬇️
src/utils/createGlmDirName.m	94.73% <0.00%> (-5.27%)	⬇️
src/workflows/stats/bidsFFX.m	75.71% <0.00%> (-0.76%)	⬇️
src/bids/fileFilterForBold.m	100.00% <0.00%> (ø)
src/subject_level/getBoldFilenameForFFX.m	77.77% <0.00%> (ø)
src/defaults/getOptionsFromModel.m	97.91% <0.00%> (+0.09%)	⬆️
src/subject_level/getFFXdir.m	91.66% <0.00%> (+0.75%)	⬆️
src/defaults/mniToIxi.m	100.00% <0.00%> (+42.85%)	⬆️

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