[2719487] Fixing off-by-one error for artificer previous start wand.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9664 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on April 19, 2009
JCBIVKZBDLOX2EOW36LW7XYDLUK5OJ4I4CC3VNYRSCQFFLFNAMFAC
Change contents