Do not mark as dirty in Grid.isEditorBuffered

Change-Id: Icba1d546f3fdc5395b71b57f1e651b56b720c0d2

server/src/com/vaadin/ui/Grid.java

@@ -6484,7 +6484,7 @@ public class Grid extends AbstractFocusable implements SelectionNotifier,
      *         <code>false</code> otherwise
      */
     public boolean isEditorBuffered() {
-        return getState().editorBuffered;
+        return getState(false).editorBuffered;
     }
 
     @Override