Revert dev mode redirect changes.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37315 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
avoid black border in IE

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37316 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e