6827032: NIMBUS: Drag and drop throws a NPE in SwingSet2 ColorChooser

Reviewed-by: malenkov

src/share/classes/javax/swing/plaf/synth/SynthColorChooserUI.java

@@ -69,6 +69,7 @@ class SynthColorChooserUI extends BasicColorChooserUI implements
     }
 
     protected void installDefaults() {
+        super.installDefaults();
         updateStyle(chooser);
     }