resprites various medigels (tgstation#78193)

## About The Pull Request
title, before and afters here. enjoy! featuring new palettes, no grey
outlines, and now featuring 50% less cruft!

![image](https://github.com/tgstation/tgstation/assets/110322848/953ee14d-e5f3-47c9-ad0a-5e533e25e5f3)
let me know if i missed any gels from this lineup and i'll go back and
update their sprites too
## Why It's Good For The Game
the old medigels were nice but had grey outlines, and mid palettes.
these remedy that, by using new palettes and a fresher design
## Changelog
:cl:
image: updates medigel sprites
/:cl: