Wave function collapse loses depth data

Fix is in:
```rust
fn render_tile_gallery(&mut self, constraints: &[MapChunk], chunk_size: i32, build_data : &mut BuilderMap) {
        build_data.map = Map::new(build_data.map.depth, build_data.width, build_data.height, &build_data.map.name);
```

Needs to be added to prior chapters.