Character display is completely black

### Testmerges

#4475, #4812, #4793, #4866, #4879, #4889

### Round ID

19471

### Description of the bug

The preview in the character creator is completely black. Cycling the background has no effect.

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

You should be able to see your marine so you can see what visual effects your customisations have.

### How do we reproduce this bug?

Currently unknown what causes this in the first place, however:
1. Open the character creator
2. Observe that the preview is solid black
3. Change any option and receive no visual feedback from the preview

### 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)