test: increase coverage for fs/dir read

test invalid callback case for fs/dir read

Refs: https://coverage.nodejs.org/coverage-f7dd330ba0e7bfa9/lib/internal/fs/dir.js.html#L91

PR-URL: https://github.com/nodejs/node/pull/36388


Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>