QmlDesigner.propertyEditor: layout fix

This is a possible fix for: QTCREATORBUG-5484

Change-Id: I9cf95c8a35615b55fa2bf299df758b62c9ad71c1
Reviewed-on: http://codereview.qt.nokia.com/1878

Reviewed-by: Thomas Hartmann <Thomas.Hartmann@nokia.com>

share/qtcreator/qmldesigner/propertyeditor/Qt/ItemPane.qml

@@ -35,6 +35,8 @@ import Bauhaus 1.0
 
 PropertyFrame {
     id: frame;
+    x: 0
+    y: 0
 
     ExpressionEditor {
         id: expressionEdit