btrfs: remove btrfs_delayed_extent_op::is_data

The value of btrfs_delayed_extent_op::is_data is always false, we can
cascade the change and simplify code that depends on it, removing the
structure member eventually.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>