Adds White-Green Armband Sprite (#4043)

# About the pull request

Adds an mob sprite to the white-green armband.

Noticed that the sprites given to the Synth in this PR
(#4026) never actually had any
mob sprites.

# Explain why it's good for the game

Sprites


# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

![Screenshot 2023-07-29 22 08
00](https://github.com/cmss13-devs/cmss13/assets/6595389/a63499ab-3446-402e-a6e0-94469185cc54)

</details>


# Changelog
:cl:
fix: EMT/White-Green armband now has a sprite
/:cl:

Co-authored-by: Steelpoint <[email protected]>