Unmark unique exit from Astral Plane to Suno-yamatoshi

The Suno-yamatoshi uses an intermediate map before exiting to
Azumauindo. Marking the intermediate map breaks the relative path to the
bank exit, trapping players in the Astral Plane.

While here, fix capitalization.

git-svn-id: svn://svn.code.sf.net/p/crossfire/code/maps/trunk@21309 282e977c-c81d-0410-88c4-b93c2d0d6712

planes/astral-vault

@@ -5,7 +5,7 @@ width 50
 height 36
 msg
 Created:  2020-02-08 Rick Tanner
-Modified: 2020-06-13 Rick Tanner
+Modified: 2020-08-24 Kevin Zheng
 endmsg
 end
 arch dungeon_magic
@@ -8534,7 +8534,7 @@ x 24
 y 1
 end
 arch exit
-name POrtal to Stoneville
+name Portal to Stoneville
 slaying /dragonisland/shops/bank_stoneville_vault
 hp 3
 sp 7
@@ -10448,7 +10448,6 @@ hp 5
 sp 2
 x 29
 y 34
-unique 1
 end
 arch dungeon_magic
 x 29