When looking for level exits, increase the range to twice the LOS

radius.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6003 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on June 20, 2008
5QZ2QFANEJ6QDBWLEWB6ZQARUB4LJHOLU7GURJJT3RKR2C6BWPSQC
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