Demonic-Frost Miner Ruin Aesthetic Refresh (tgstation#78826)

## About The Pull Request

Updates the Demonic-Frost Miner ruin on IceBox, keeps multi-z and
general shape, but changes some things to better fit the theme of the
"Mining Site" that the ruin is named.

![image](https://github.com/tgstation/tgstation/assets/86125936/0693bc59-1130-445d-ace9-61fa65f4639f)

![image](https://github.com/tgstation/tgstation/assets/86125936/cc056de8-2ee4-4506-a6d8-706594af12c6)
## Why It's Good For The Game

The current ruin doesn't fit well as a "Mining Site", this makes it fit
the theme more, while looking better in general. It also makes the arena
more interesting, rather than solid ice.
## Changelog
:cl:
add: Demonic-Frost Miner's ruin gets an aesthetic refresh
/:cl: