Fix: don't test default cache paths when one provided

[emmercm]

Fixes: #1135

[github-actions]

🧪 Branch testing instructions

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

npm exec --yes -- "github:emmercm/igir#emmercm/1135-fix" [commands..] [options]

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[codecov]

Codecov Report

Attention: Patch coverage is 71.87500% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 93.19%. Comparing base (4e9033a) to head (9ca83f5).

Files	Patch %	Lines
src/igir.ts	63.63%	8 Missing ⚠️
src/polyfill/fsPoly.ts	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1145      +/-   ##
==========================================
- Coverage   93.26%   93.19%   -0.07%     
==========================================
  Files         102      102              
  Lines        6351     6364      +13     
  Branches     1513     1409     -104     
==========================================
+ Hits         5923     5931       +8     
- Misses        406      432      +26     
+ Partials       22        1      -21     

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[github-actions]

🔒 Inactive pull request lock

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.

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