[1693541] Fixed unmapped stair positions being revealed by their colour.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1223 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on April 5, 2007
OT53X5ORPLBVG4SRIM5PTQ5ERZLZELB7ZKR6ZKDKVOD7IJR6VDOQC
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