Fix incorrect error report on vdev attach/replace

Report the correct error message in libzfs when attaching/replacing a
vdev with a higher ashift.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes #16449