Don't do a full redraw when travel_delay = -1

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@775 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on January 2, 2007
4JHOVOBLMS7QYIG7URN2YWNQ65FSCVWOI3W3TLIUMPXZ4P2QH7XAC
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