Change the Zerocell dungeon warp coordinates

Imported from legacy Flarum.
Original author: telu (Flarum #782)

Right now warping to Zerocell via warper makes you spawn on top of the NPC you need to talk to in order to enter the dungeon, which makes it hard to talk to if there’s a wide Pet or an Homunculus with you (or if someone TP’d then went afk without moving), so please change the spawn point somewhere a bit lower, thank you very much.