Properties error

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31978 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
fix for JOptionPane icon bug with AutoCreateSlider dialog

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31979 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e