Drag and drop functions into a graph is not being added to the undo history

When dragging and dropping a function into a graph the action will not be added to the undo filter because of this undoing after dragging the function into the graph causes the node to change instead of being removed.

1. Create an actor BP and open it
2. Create a function
3. Switch back to event graph
4. Drag and drop function
   Result: The adding of the function is not added to the undo filter