xfs/365: fuzz inobt in ag 1

xfs/365: fuzz inobt in ag 1

In kernel patch "xfs: verify root inode more thoroughly", we strengthen
the root inode mount checks to make sure that the inobt agrees that the
root inode exists and is in use.  Unfortunately, that makes this whole
test useless because we can't even mount the filesystem to run scrub.
So, redirect it to AG1's inobt.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>