Fixed bug with branch level stairs in Pan.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@889 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on January 26, 2007
5O7S2U2B5R7HYML3D66557BC56RG6XH66PFYP6NDJZMXOABMEUKQC
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