Fix 2078482: Backwards Stealth check.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6909 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on September 11, 2008
722HIS4N7MWBLALPEMTJXURRTZX2V5YMCA3F7LI3TELVIEEZLCIQC
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