Fix flaky getOrUpdateOpt test

[stasimus]

The second getOrUpdateOpt started via startEnsure could reach the cache after the first load already completed with None and removed the entry, so it did its own load and returned Some(0). Dropped the waiter, same shape as the getOrUpdateOpt1 test. Seen in https://github.com/evolution-gaming/scache/actions/runs/33754583586

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