[Magiclysm] Change Used Bookstore magic circle room to have stone walls

[pepesito1122]

Summary

SUMMARY:Bugfixes "Keeping Nothics in Used Bookstores"

Purpose of change

Nothics currently are surrounded by walls that are simply too weak to properly contain them, as they can easily destroyed by a character wielding a weapon capable of destroying walls or zombie hordes that can bring down a whole building. This fix seeks to keep that from happening.

Describe the solution

I surrounded their keeping cell with stone walls. They are far more resilient than normal walls and keep them from wondering around and killing unsuspecting players unfairly.

Describe alternatives you've considered

Steel or brick walls. Stone just seems more appropriate.

Additional context

I saw Vorm on his Twitch get ganked by two of them when -I suspect- zombies tore down the Used Bookstore and freed them. It was a crappy way to kill a run, and needed to be fixed soon

[KorGgenT]

needs linting

[pepesito1122]

Do believe I've properly linted this json now