update timestamp ch.swisstopo.geologie-geophysik-geothermie

git-svn-id: https://svn.bgdi.admin.ch/tilegenerator/trunk@456 bd729b38-e83c-4c31-ba7f-6b5d0bf862be
Try to increase the tilgeneration speed of blw layer

git-svn-id: https://svn.bgdi.admin.ch/tilegenerator/trunk@457 bd729b38-e83c-4c31-ba7f-6b5d0bf862be