Fix annoying behaviour with cursor being left at the end of prompt lines

instead of centered on the @.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9723 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on May 3, 2009
PHZ7SC3NX45V7DYAMRFCL2FF2TQATDGASBNLNZ6U5PCYHXMYXJAAC
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