Crew Manifest* lists mobs that are spawned outside of Ground/Map Z. I.E Admin spawned and ERTs

### Testmerges

N/A

### Round ID

N/A

### Description of the bug

Title.
It lists mobs in thunderdome and other places not relevant to what the Almayer console should be able to seeeeeeee.

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

Mobs in Thunderdome that would show up on Crew Monitor like FORECON or whatever shouldn't show up on the Crew Monitor if they're not in Map Z or Ground Z

### How do we reproduce this bug?

1. Spawn FORECON SG in the Thunderdome
2. Marines wonder why FORECON is on the Crew Manifest
3.
...

### 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)

Start by locating the code that populates the Crew Manifest/Crew Monitor and inspect how mob locations are checked against Ground Z and Map Z. Reproduce the issue by spawning FORECON SG in the Thunderdome, then verify that mobs outside those Z-levels no longer appear on the Almayer console.

Written by the indexing model from the issue text.