Fix legacy partimage settings as they originally created partitions at start sector 63s and not 2048s which we currently specify.  This takes into account this fact and corrects it so images can deploy properly.

git-svn-id: https://svn.code.sf.net/p/freeghost/code/trunk@2051 71f96598-fa45-0410-b640-bcd6f8691b32