Fix JDF-761 test failure in ticket monster

Unless an @OrderBy annotation is used, the order of ticketPrices is
undeterministic. However, with @OrderBy annotation in place, Hibernate
will inject an appropriate LinkedHashSet instance [1], which preserves
elements in order they were inserted.

Adjust testCreateBookings based on the new ticketPrices order.

[1] http://docs.jboss.org/hibernate/orm/4.2/manual/en-US/html/ch07.html#d5e5531