freebsd: Correct the order of arguments to copyin() for Q_SETQUOTA

Sponsored by: DARPA
External-issue: https://reviews.freebsd.org/D24656
FreeBSD-commit: freebsd/freebsd@a431c095d32df45a31faad8382b9bc712480e27e

Authored by: jhb <jhb@FreeBSD.org>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #10344