test: remove unused symlink loop

This symlink loop was originally intended to be accessed from
a test. Instead, a loop is created by the test itself, but this
was unfortunately forgotten about. It's unused, so remove it.

PR-URL: #31267
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: cjihrig