xfs: clear pagf_agflreset when repairing the AGFL

Clear the pagf_agflreset flag when we're repairing the AGFL because we
fix all the same padding problems that xfs_agfl_reset does.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>