Use correct filename for custom stylesheet

[ddaspit]

• fixes Non-verse custom style markers are not removed from Scripture text rows #204

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This change is 

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.22807% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.91%. Comparing base (f1778e1) to head (d39c7b0).

Files with missing lines	Patch %	Lines
...rpora/zip_paratext_project_settings_parser_base.py	76.19%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #230      +/-   ##
==========================================
+ Coverage   90.88%   90.91%   +0.03%     
==========================================
  Files         335      337       +2     
  Lines       21474    21524      +50     
==========================================
+ Hits        19517    19569      +52     
+ Misses       1957     1955       -2     

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[Enkidu93]

@Enkidu93 reviewed 1 of 3 files at r1, 1 of 4 files at r2, 3 of 3 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ddaspit)