Only one matrix multiplication in vertex shader

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37040 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
clean code

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37041 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e