* Fixes attempting to offset floating planes (#71490)
## About The Pull Request
This is a dumb idea, and leads to fucked rendering on occasion
## Why It's Good For The Game
Fixes another portion of #70258, a player will no longer have a hidden
antag hud if they move down a z level after getting an antag. We were
trying to offset the floating plane of their image, and it went to shit.
Also fixes a bug with observers not having antag huds for the combo hud
to see. We were only giving them one on mind.on_transfer, rather then on
mind assignment. I hate mindcode
* Fixes attempting to offset floating planes
Co-authored-by: LemonInTheDark <58055496+LemonInTheDark@users.noreply.github.com>