[FIX] skip smoothing when running bidspm prepoc in dryRun

[Remi-Gau]

closes #1032

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.58%. Comparing base (1673401) to head (20112e0).
Report is 185 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1054       +/-   ##
===========================================
+ Coverage   38.99%   81.58%   +42.58%     
===========================================
  Files           4      241      +237     
  Lines         259     6402     +6143     
  Branches       40        0       -40     
===========================================
+ Hits          101     5223     +5122     
- Misses        142     1179     +1037     
+ Partials       16        0       -16     

Flag	Coverage Δ
cli	?
macos-latest_matlab-R2022b	81.19% <ø> (?)
octave	77.10% <ø> (?)
ubuntu-latest_matlab-R2022b	81.36% <ø> (?)

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