Limit file collection to specified subject

[tsalo]

Closes none, but the subject workflow was collecting data for all subjects in the dataset.

Changes proposed in this pull request

• Add "subject" to the filter dictionary when looking for data.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 30.59%. Comparing base (df73880) to head (4353d55).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
src/fmripost_aroma/workflows/base.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
- Coverage   30.62%   30.59%   -0.03%     
==========================================
  Files          26       26              
  Lines        2361     2363       +2     
  Branches      374      374              
==========================================
  Hits          723      723              
- Misses       1615     1617       +2     
  Partials       23       23              

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