Fix drop ball bug introduced yesterday
Yesterday I introduced some new code where we could detect a vanished ball but not trigger the notification that a ball drop was complete if the ball was being vanished due to it being a blocked ball. This was a bit flawed but unfortunatey I didn't notice it until it was too late. Basically it would not trigger for a ball that vanished because it got to the goal, because I used the wrong variable to track if the event should trigger or not (_droppedBall instead of _lastDroppedBall) and since _droppedBall gets cleared as soon as the vanish is called, such a ball is treated like a blocked ball. This has been fixed by using the correct variable.
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