tdf#53993 broadcast the change when dragging ends.

Eventually MotionPathTag::Notify() and CustomAnimationPane::
updatePathFromMotionPathTag will be called to update the
motion path of the effect.

Change-Id: I1cd0756ea24d9b56ad3c44c99ef015c584c74dc7
Reviewed-on: https://gerrit.libreoffice.org/56353
Tested-by: Jenkins
Reviewed-by: Mark Hung <marklh9@gmail.com>

sd/source/ui/animations/motionpathtag.cxx

@@ -231,9 +231,11 @@ bool PathDragObjOwn::EndSdrDrag(bool /*bCopy*/)
 
     SdrObject* pObj = GetDragObj();
 
-    if(pObj)
+    if(pObj && pObj->applySpecialDrag(DragStat()))
     {
-        return pObj->applySpecialDrag(DragStat());
+        pObj->SetChanged();
+        pObj->BroadcastObjectChange();
+        return true;
     }
     else
     {