SvxShape destructor un-register at broadcaster with SolarMutex locked

Change-Id: Ie9bd6d0fc1b221e77c4d37a26c999aa34afbe0ee

svx/source/unodraw/unoshape.cxx

@@ -238,6 +238,7 @@ SvxShape::~SvxShape() throw()
 
     delete mpImpl, mpImpl = NULL;
 
+    EndListeningAll(); // call explictily within SolarMutexGuard
 }