Chapter 61 (Section 5.19) Movement System Teleporting Error

I am wondering if there is an error in chapter 61, which introduces the new movement system.

In the **Apply teleports** part, we first check if the depth of the teleport and the map's depth are the same. If that's not the case and we are not moving the player, the entity is teleported to **another** map, as depicted in the following code.

```rust
for (entity, teleport) in (&entities, &apply_teleport).join() {
if teleport.dest_depth == map.depth {
// omitted
} else if entity == *player_entity {
// omitted
} else if let Some(pos) = position.get(entity) {
// [...]
crate::spatial::move_entity(entity, idx, dest_idx);
other_level.insert(entity, OtherLevelPosition{
x: teleport.dest_x,
y: teleport.dest_y,
depth: teleport.dest_depth })
.expect("Unable to insert");
position.remove(entity);
}
}
```

Please correct me if I am wrong, but I think we need to remove the entity from the spatial map (`crate::spatial::remove_entity`) instead of moving it, right? It is not anymore part of the current map. This problems sorts itself out the next time `MapIndexingSystem` runs, but succeeding systems of the current loop would still see incorrect information.

I am happy to create a pull request with the necessary changes, in case I am right with my assessment.