Use app.isPrerelease rather than GeoGebraConstants.isPrerelease

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37251 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
draw 3d curves in the Algebra View nicely

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37252 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e