QmlDesigner: Fix warnings about overshoot

overshoot is deprecated

src/plugins/qmldesigner/components/itemlibrary/qml/ItemsView.qml

@@ -182,7 +182,7 @@ reasons and then passed to the section views */
                                 anchors.bottom: parent.bottom
                                 anchors.left: parent.left
                                 anchors.right: scrollbarFrame.left
-                                overShoot: false
+                                boundsBehavior: Flickable.DragOverBounds
 
                                 interactive: false
                                 contentHeight: col.height

src/plugins/qmldesigner/components/stateseditor/stateslist.qml

@@ -67,7 +67,7 @@ Rectangle {
 
         focus: true;
         clip: true;
-        overShoot: false;
+        boundsBehavior: Flickable.DragOverBounds;
         interactive:false;
 
     }