theories/ticket_lock.v: simplify proof of release_spec#17
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It is not necessary to show that the first counters from the invariant and the `locked` precondition are the same, because `exclusive_local_update` allows arbitrary counters before the update.
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It is not necessary to show that the first counters from the invariant and the
lockedprecondition are the same, becauseexclusive_local_updateallows arbitrary counters before the update.