[1771495] Fruit tree minivaults did not substitute placeholder a with floor,

fixed.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1989 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on August 10, 2007
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