btrfs: qgroup: consolidate the parameter of fucntion update_qgroup_limit_item().

Cleanup: Change the parameter of update_qgroup_limit_item() to the family of
update_qgroup_xxx_item().

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>