btrfs: remove root argument from btrfs_delayed_item_reserve_metadata()

The root argument of btrfs_delayed_item_reserve_metadata() is used only
to get the fs_info object, but we already have a transaction handle, which
we can use to get the fs_info. So remove the root argument.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>