[1727099] Monster spotted on the edge of FOV that immediately turns invisible

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

Created by  dshaligram  on June 2, 2007
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