Bug #2455248: open Slime:6 vaults if the Royal Jelly is polymorphed.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7925 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on December 23, 2008
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