btrfs: move block_group_item::flags to block group

The flags are read from the item that's embedded to block group struct,
but the item will be removed. Use the ::flags after read and before
write.

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>