[w3c/ServiceWorker] Should update() called on an installing worker reject (as currently does?) (#1155)

`registration.update()` step 5 has:
> If the context object’s relevant settings object’s global object globalObject is a ServiceWorkerGlobalScope object, and globalObject’s associated service worker's state is installing, reject p with an "InvalidStateError" exception and abort these steps.

@mattto, @wanderview, AFAICT, Chrome doesn't have this error checking. Does Firefox check this? Do we need this error checking here?

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