Export settings dialog: Pass subregion limits explicitly

[btbest]

With ilastik/ilastik#3070, the model op is no longer pre-cropped to the max bounds of the subregion spin boxes. The bounds need to be passed explicitly now.

[codecov]

Codecov Report

❌ Patch coverage is 28.57143% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.32%. Comparing base (e6d37a5) to head (3ddb735).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
volumina/widgets/dataExportOptionsDlg.py	28.57%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #335      +/-   ##
==========================================
- Coverage   36.33%   36.32%   -0.01%     
==========================================
  Files         108      108              
  Lines       11434    11438       +4     
==========================================
+ Hits         4154     4155       +1     
- Misses       7280     7283       +3     

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