Disposaled mob runtimes

### Testmerges

None, local server

### Round ID

_No response_

### Description of the bug

Disposaling a minimap tracked mob causes a torrent of runtimes in minimap.dm lines 369, 352, 375

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

Less runtimes please

### How do we reproduce this bug?

1. In Modifiers-Panel enable Allow Disposing Mobs
2. Join game as USCM personnel
3. Climb into disposals unit and get flushed
4. All the runtimes you could ever want

### 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)

Reproduce the disposal flow with Allow Disposing Mobs enabled, joining as USCM personnel and being flushed through the disposals unit. Inspect minimap.dm around lines 352, 369, and 375 while observing the runtime output. Done means the reproduction no longer produces a torrent of runtimes.

Written by the indexing model from the issue text.