xfs: show the proper user quota options

The quota option 'usrquota' should be shown if both the XFS_UQUOTA_ACCT
and XFS_UQUOTA_ENFD flags are set. The option 'uqnoenforce' should be
shown when only the XFS_UQUOTA_ACCT flag is set. The current code logic
seems wrong, Fix it and show proper options.

Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>