Makes all Prison Station metal ceilings into glass ceilings (and another PoS fix)

[Barnet2]

About The Pull Request

Title. (THIS DOES NOT INCLUDE UNDERGROUND ROOFS)

Why It's Good For The Game

This changes (I believe) only two main things:

1. Pods can now drop into Prison Station
2. Tad can now land everywhere that isn't underground
   The issue here is arbitrarily making the entirely "indoors" map having metal roofs or not, like is normally easily done in a map (if there is a building it has a roof!) Marines will still have to clear out walls for tad/pods, etc. If you think there is an area on Prison Station that really, really should not have tadpole land (besides the already existing underground) just say in the comments and I can change it.

Changelog

🆑
balance: Prison Station metal roofs are now glass, allowing marines to pod and land Tadpole.
fix: Fixes some stray wall props on Pillar of Spring.
/:cl:

[Lumipharon]

You really want to make it ALL glass roofs? That makes prison far more open than any other map in the game, and tank already lets marines do the funny on that map.