Reduce the minimum distance from the player that pacified monsters have

to be in order to disappear (for e.g. those too stupid to go down the right set of stairs).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9621 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on April 18, 2009
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