Fix z-order of label and shape.

Author: brunomnsilva

src/main/java/com/brunomnsilva/smartgraph/graphview/SmartGraphVertexNode.java

@@ -500,10 +500,10 @@ private void enableDrag() {
                 isDragging = true;
 
                 // Bring the node to the front, together with the label
+                toFront();
                 if(hasLabel()) {
                     getAttachedLabel().toFront();
                 }
-                toFront();
 
                 mouseEvent.consume();
             }