QmlOutline: Show non-leaf bindings even when filter is active

Otherwise we would filter out also e.g. all States elements.

src/plugins/qmljseditor/qmloutlinemodel.h

@@ -67,7 +67,8 @@ public:
 
     enum ItemTypes {
         ElementType,
-        PropertyType
+        ElementBindingType, // might contain elements as childs
+        NonElementBindingType // can be filtered out
     };
 
     QmlOutlineModel(QObject *parent = 0);