QmlDesigner: Fix warnings

- unused variables
- mis-ordered field initializations

Change-Id: I9f265799597e7c0f4f41cbb20edf19c48cae4c0e
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/qmldesigner/components/debugview/debugview.cpp

@@ -515,6 +515,7 @@ void DebugView::currentStateChanged(const ModelNode &/*node*/)
 
 void DebugView::nodeOrderChanged(const NodeListProperty &listProperty)
 {
+    Q_UNUSED(listProperty)
     if (isDebugViewEnabled()) {
         QTextStream message;
         QString string;