[w3c/ServiceWorker] Worker Update leaves open notifications behind (unclickable) (#1337)

We open clickable notifications trough our ServiceWorker. When the browser then updates a ServiceWorker (cache expired, or forces trough `ServiceWorkerRegistration.update`), the remaining open notifications become *unclickable*.
I am not sure if should be is the desired behaviour or if I am missing something here.

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https://github.com/w3c/ServiceWorker/issues/1337