Map had to exits or entrances stacked on top of each other, removed the invisible exit/entrance and gave the magical portal the destinatin coordinates and map path instead.

git-svn-id: svn://svn.code.sf.net/p/crossfire/code/maps/trunk@5683 282e977c-c81d-0410-88c4-b93c2d0d6712

navar_city/mlab/ttower34

@@ -3029,20 +3029,14 @@ arch cwall_2_1_2
 x 12
 y 7
 end
-arch invis_exit
-slaying ttowerchoswld1
-hp 19
-sp 44
-x 12
-y 8
-end
 arch flagstone
 x 12
 y 8
 end
 arch perm_magic_portal
-hp 0
-sp 0
+slaying ttowerchoswld1
+hp 19
+sp 44
 x 12
 y 8
 end