afl-eventtesting + VclPtr: missing dispose on impress annotation window

regression from

commit c72fac26
Date:   Mon Mar 16 12:17:44 2015 +0200

    vclwidget: convert lots more sites to use VclPtr

Change-Id: Iac6a83003d9c395589acdc23fe511d2bb47e91ee

sd/source/ui/annotations/annotationtag.cxx

@@ -604,7 +604,7 @@ void AnnotationTag::ClosePopup()
     {
         mpAnnotationWindow->RemoveEventListener( LINK(this, AnnotationTag, WindowEventHandler));
         mpAnnotationWindow->Deactivate();
-        mpAnnotationWindow.reset();
+        mpAnnotationWindow.disposeAndClear();
     }
 }