Fix: write fixdats to the output dir root

[emmercm]

Fixes: #1200

[github-actions]

🧪 Branch testing instructions

This pull request can be tested locally with the following command:

npm exec --yes -- "github:emmercm/igir#emmercm/fixdat-dir-root" [commands..] [options]

Comment generated by the Pull Request Commenter workflow.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 93.15%. Comparing base (17b6860) to head (d14a9bc).

Files	Patch %	Lines
src/modules/fixdatCreator.ts	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1205      +/-   ##
==========================================
- Coverage   93.16%   93.15%   -0.02%     
==========================================
  Files         105      105              
  Lines        6486     6490       +4     
  Branches     1537     1528       -9     
==========================================
+ Hits         6043     6046       +3     
+ Misses        442      421      -21     
- Partials        1       23      +22     

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