This fixes an issue where there's a floating '=' x 80 line on the help screen sometimes, due to the graphical and textual draw_stock_item functions being inappropriately mixed.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7965 c06c8d41-db1a-0410-9941-cceddc491573
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