DS in Transit: Binocs can see the walls

### Testmerges

Always present

### Round ID

Always present

### Description of the bug

If the DS is in transit, and you use binocs to look out the window, you can see the wall of the Z-level. My immersions...

### What's the difference with what should have happened?

Shouldn't see walls.

### How do we reproduce this bug?

1. Put DS in transit"
2. Use binocs to look out window

### Issue Bingo

- [x] Issue could be reproduced at least once
- [x] Issue happened in a recent (less than 7 days ago) round
- [x] Couldn't find an existing issue about this (https://github.com/cmss13-devs/cmss13/issues)