Fix #441: update spelling of prop descriptor prop

[fatso83]

Purpose (TL;DR) - mandatory

Fix issue #441 by fixing a spelling error

Background (Problem in detail) - optional

See #441. Node 18.8 seems to have the writable prop of the Performance fields set to false by default and our test did incorrectly try to re-configure it.

[codecov]

Codecov Report

Base: 95.51% // Head: 95.51% // No change to project coverage 👍

Coverage data is based on head (b450bad) compared to base (62ad45c).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #453   +/-   ##
=======================================
  Coverage   95.51%   95.51%           
=======================================
  Files           1        1           
  Lines         624      624           
=======================================
  Hits          596      596           
  Misses         28       28           

Flag	Coverage Δ
unit	95.51% <ø> (ø)

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Impacted Files	Coverage Δ
src/fake-timers-src.js	95.51% <0.00%> (ø)

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[mroderick]

Thank you ❤️