Stabbing of distracted monsters was too easy in 0.2, moved it up a little

closer to 0.1-levels (it's still easier than in 0.1).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1767 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on July 6, 2007
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