[w3c/ServiceWorker] Change the spec so that when a new SW is being registered it's set to not use cache the first time (#1103)

When a new Service Worker is getting installed there may be times where the Service Worker's script file is already cached, but it wasn't being used for it's current use case. So even if the Service Worker is getting installed with useCache, it might make sense to bypass cache for the first time this new Service Worker is getting installed.

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