update when registrar is available, dont set menumodel on SetFrame, we do that on update

vcl/unx/gtk/window/gtkframe.cxx

@@ -564,6 +564,7 @@ on_registrar_available (GDBusConnection * /*connection*/,
                 pMenuBar->SetDisplayable( sal_False );
             }
         }
+        pSalMenu->UpdateNativeMenu();
     }
 
     return;

vcl/unx/gtk/window/gtksalmenu.cxx

@@ -396,8 +396,6 @@ void GtkSalMenu::SetFrame( const SalFrame* pFrame )
     if(mpActionGroup)
         g_lo_action_group_clear( G_LO_ACTION_GROUP(mpActionGroup) );
     pFrameNonConst->EnsureAppMenuWatch();
-    mpMenuModel = G_MENU_MODEL( g_object_get_data( G_OBJECT( pWindow ), "g-lo-menubar" ) );
-    mpActionGroup = G_ACTION_GROUP( g_object_get_data( G_OBJECT( pWindow ), "g-lo-action-group" ) );
     // Generate the main menu structure.
     UpdateNativeMenu();
 }