test: avoid call to chmodSync in test-fs-cp-async-file-modes

[aduh95]

Fixes: NixOS/nixpkgs#564449

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.28%. Comparing base (9b82b6f) to head (0fa81a4).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #66104   +/-   ##
=======================================
  Coverage   90.28%   90.28%           
=======================================
  Files         790      790           
  Lines      271642   271642           
  Branches    51846    51838    -8     
=======================================
+ Hits       245248   245254    +6     
+ Misses      16892    16889    -3     
+ Partials     9502     9499    -3     

see 32 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/77615/