[2784933] Fix monsters sometimes not stopping travel.

This may break messaging for monsters coming into view.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9725 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on May 3, 2009
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