bug fixes for js global variables (#4300)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33682 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
clean init for js global variables (#4300)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33683 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e