tdf#152683 LO Draw ignoring Undo:Resize Grouped Object

regression from
  commit 4e24efb563cbe6fec4185b4f7ec3755b2fc05b6b
  tdf#54857 elide more dynamic_cast

Change-Id: I4fbabe64649ee47a9360dd939b5f39d35bd29c51
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/144858
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
diff --git a/svx/source/svdraw/svdundo.cxx b/svx/source/svdraw/svdundo.cxx
index 20be7b8..c0ad2f3 100644
--- a/svx/source/svdraw/svdundo.cxx
+++ b/svx/source/svdraw/svdundo.cxx
@@ -560,7 +560,7 @@ SdrUndoGeoObj::SdrUndoGeoObj(SdrObject& rNewObj)
     , mbSkipChangeLayout(false)
{
    SdrObjList* pOL=rNewObj.GetSubList();
    if (pOL!=nullptr && pOL->GetObjCount() && DynCastE3dScene(&rNewObj))
    if (pOL!=nullptr && pOL->GetObjCount() && !DynCastE3dScene(&rNewObj))
    {
        // this is a group object!
        // If this were 3D scene, we'd only add an Undo for the scene itself