Don't close login window if login not successful

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34413 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Removed dead code

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34415 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e