was not stopping explore, fixed. Well, hacked. There's no perfect solution to this if we also want to avoid stopping travel/explore for monsters that show up and then leave FOV.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1507 c06c8d41-db1a-0410-9941-cceddc491573
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