Remove incorrect comment

src/editor.cpp

@@ -1673,9 +1673,6 @@ void Editor::clearMapEvents() {
         if (events_group->scene()) {
             events_group->scene()->removeItem(events_group);
         }
-        // events_group does not own its children, the childrens' parent
-        // is set to the group's parent (and our group has no parent).
-        qDeleteAll(events_group->childItems());
         delete events_group;
         events_group = nullptr;
     }