xfs: make XFS_TRANS_LOWMODE match the other XFS_TRANS_ definitions

xfs: make XFS_TRANS_LOWMODE match the other XFS_TRANS_ definitions

Source kernel commit: 330c4f94b0d73e440de3f738a625e38defe1bc15

Commit bb7b1c9c5dd3 ("xfs: tag transactions that contain intent done
items") switched the XFS_TRANS_ definitions to be bit based, and using
comments above the definitions.  As XFS_TRANS_LOWMODE was last and has
a big fat comment it was missed.  Switch it to the same style.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>