QmlDesigner: Avoid drag and drop faulty state

Avoid the issue described in QTBUG-106943 by reducing the animation
duration.

Change-Id: Ide2004885d945680fa80cb8d0f10968ae33c8611
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
Reviewed-by: Brook Cronin <brook.cronin@qt.io>

share/qtcreator/qmldesigner/newstateseditor/Main.qml

@@ -593,6 +593,7 @@ Rectangle {
                             NumberAnimation {
                                 properties: "x,y"
                                 easing.type: Easing.OutQuad
+                                duration: 100
                             }
                         }