Gives AI displays "proper" multiz station support (#68864)
Gives AI displays "proper" multiz station support (#68864)

* Gives AI displays "proper" multiz support

* This actually works

* is_valid_z_level
ShizCalev/tgstation,ShizCalev/tgstation,MicroWorldwide/SS13-TG-station,tgstation/tgstation,MicroWorldwide/SS13-TG-station,tgstation/tgstation,ShizCalev/tgstation,Bawhoppen/-tg-station,MicroWorldwide/SS13-TG-station,CPTANT/-tg-station,Bawhoppen/-tg-station,CPTANT/-tg-station,Bawhoppen/-tg-station,tgstation/tgstation,tgstation/tgstation,CPTANT/-tg-station,MicroWorldwide/SS13-TG-station,MicroWorldwide/SS13-TG-station,MicroWorldwide/SS13-TG-station,Bawhoppen/-tg-station,tgstation/tgstation,tgstation/tgstation,Bawhoppen/-tg-station,tgstation/tgstation,ShizCalev/tgstation,MicroWorldwide/SS13-TG-station,Bawhoppen/-tg-station,CPTANT/-tg-station,ShizCalev/tgstation,CPTANT/-tg-station,CPTANT/-tg-station,CPTANT/-tg-station,tgstation/tgstation,CPTANT/-tg-station,ShizCalev/tgstation,Bawhoppen/-tg-station,ShizCalev/tgstation,MicroWorldwide/SS13-TG-station,ShizCalev/tgstation,Bawhoppen/-tg-station