Fixes the Party Alarm and slows down the animation (tgstation#73703)

## About The Pull Request

tgstation#66726 deleted the icon state for the party alarm overlay, I've re-added
it.

Concerns were brought up on discord about the speed in which the colors
changed being a potential seizure risk so I've slowed down the speed of
the animation.
## Why It's Good For The Game

Without a working party alarm the game is unplayable.
## Changelog
:cl:
fix: The party alarm now works again!
/:cl: