Oops, wasn't properly shifting sanctuary center when doing an Abyss

area shift.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6355 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on July 2, 2008
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