fix #21099: don't delete auto generated elements immediately

Before PR #20367, we only deleted them when the user closed the score and the undo stack got cleared
Now, they will be deleted along with the dummy element when closing the score

src/engraving/dom/score.cpp

@@ -1734,7 +1734,8 @@ void Score::doUndoRemoveElement(EngravingItem* element)
 {
     if (element->generated()) {
         removeElement(element);
-        element->deleteLater();
+        //! HACK: don't delete as it may still be used in Inspector
+        // element->deleteLater();
     } else {
         undo(new RemoveElement(element));
     }