test: fix test-require-symlink on Windows

Creating directory symlinks on Windows require 'dir' parameter to be
provided.

Fixes: https://github.com/nodejs/node/issues/23596

PR-URL: https://github.com/nodejs/node/pull/23691


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>