[FIX] Force copy of data from fmriprep folder even if bidspm-preproc folder exists

[marcobarilari]

See #1006

[Remi-Gau]

Let's wait for the ci to finish but looking good.

[Remi-Gau]

The CI failure on octave is unrelated to this PR: it was there before.
I know I need to fix it.

So this PR can go in.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.78%. Comparing base (05d92e9) to head (977d2b2).
Report is 206 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1009   +/-   ##
=======================================
  Coverage   79.78%   79.78%           
=======================================
  Files         242      242           
  Lines        6594     6594           
  Branches       40       40           
=======================================
  Hits         5261     5261           
  Misses       1317     1317           
  Partials       16       16           

Flag	Coverage Δ
cli	38.99% <ø> (ø)
matlab	81.45% <ø> (ø)

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