Update install_mapserver.sh
Update install_mapserver.sh

Changed the script to point to demo updated for MapServer 7.0.
kalxas/OSGeoLive,guygriffiths/OSGeoLive,guygriffiths/OSGeoLive,OSGeo/OSGeoLive,OSGeo/OSGeoLive,guygriffiths/OSGeoLive,astroidex/OSGeoLive,kalxas/OSGeoLive,kalxas/OSGeoLive,PascalLike/OSGeoLive,OSGeo/OSGeoLive,PascalLike/OSGeoLive,astroidex/OSGeoLive,astroidex/OSGeoLive,PascalLike/OSGeoLive,kalxas/OSGeoLive,OSGeo/OSGeoLive,guygriffiths/OSGeoLive,guygriffiths/OSGeoLive,astroidex/OSGeoLive,kalxas/OSGeoLive,astroidex/OSGeoLive,kalxas/OSGeoLive,PascalLike/OSGeoLive,PascalLike/OSGeoLive,OSGeo/OSGeoLive,PascalLike/OSGeoLive,guygriffiths/OSGeoLive,PascalLike/OSGeoLive,OSGeo/OSGeoLive,OSGeo/OSGeoLive,guygriffiths/OSGeoLive,kalxas/OSGeoLive,astroidex/OSGeoLive