test-fdutimensat: fix newly-added test Problem reported by Bruno Haible and Collin Funk in: https://lists.gnu.org/r/bug-gnulib/2024-08/msg00061.html https://lists.gnu.org/r/bug-gnulib/2024-08/msg00064.html * tests/test-utimens.h (test_utimens): Fix typo in new test, which causes the test to break on file systems that are not noatime.