Fix a bug; do not reap balls that are hidden
Yesterday's woes are caused by the fact that the update loop is constantly trying to reap hidden balls by marking them as dead. This is an issue because a dead ball will not render or update, which means that any computer balls that are hidden are almost immediately killed, causing them to no longer update even though they're still in the maze. Since we render all balls that are alive, this means that once the scene is set up with a set of live balls, it always looks like this even when the balls are swapped into the maze, because they won't overwrite themselves. Grrr.
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