Adjust big chest region

Putting it in Darcap means that you hear the church bells from Darcap;
however players reported that this is confusing because all guilds go to
one big chest.

planes/bigchest

@@ -2,14 +2,14 @@ arch map
 name Guild Bigchest
 reset_timeout 300
 difficulty 1
-region darcap
+region astralplane
 width 5
 height 5
 enter_x 2
 enter_y 2
 msg
 Created: 12-23-2001 Alestan
-Modified: 2012-02-19 Rick Tanner
+Modified: 2024-03-22 Kevin Zheng
 endmsg
 end
 arch woodfloor2