test: fix a typo on test-fs-read-optional-params
related PR #31402, and commit https://github.com/nodejs/node/commit/b6da55f0fda60433f8d05539ee8665f66a35ee86
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines