btrfs: remove unused BTRFS_TOTAL_BYTES_PINNED_BATCH

This hasn't been used since 138a12d8 ("btrfs: rip out
btrfs_space_info::total_bytes_pinned") so it is safe to remove.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>