[w3c/ServiceWorker] When should "imported scripts updated flag" be unset? (#1021)

`importScripts` has two behaviours. One where it fetches from the network and adds to its "script resource map", and another where it fetches only from the "script resource map".

This allows `importScripts` during initial execution to implicitly populate the cache while the service worker is not-active, then later work without the network by using this cache.

The spec flips the switch once install has completed, but @mattto and @wanderview say implementations flip the switch after the first synchronous run of the service worker script.

Should the spec match implementations?

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