Send the actual applet to ggbOnInit

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35640 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Allow _ in applet ID

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35641 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e