fix different background colors (koljas schuld)

src/view/MainView.java

@@ -695,7 +695,6 @@ public class MainView {
         pseudoTree.setBackground(RenderHelper.BACKGROUND_COLOR);
         PseudoCodeNode tree = algorithm.createPseudocodeTree( pseudoTree );
         tree.setController( controller );
-        pseudoTree.setBackground( new Color( 0x1e1e1e ) );
         pseudoTree.setModel( new DefaultTreeModel( tree ) );
         pseudoTree.setCellRenderer( new PseudoCodeRenderer() );
         pseudoTree.setSelectionModel( null );