Btrfs: remove wait queue from space_info structure

It is not used anymore since commit 957780eb ("Btrfs: introduce
ticketed enospc infrastructure"), so just remove it.

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