Duke3D: Fix an error with the bonus tile, and extend EVENT_GETBONUSTILE
Within EVENT_GETBONUSTILE, you can now set ud.return[0] to ud.return[4] to change each frame of the bonus screen animation separately.
Within EVENT_GETBONUSTILE, you can now set ud.return[0] to ud.return[4] to change each frame of the bonus screen animation separately.