[w3c/ServiceWorker] Please default fetch() init credentials to 'same-origin' (#1234)

Calling `fetch()` while using web authentication makes `fetch()` request fail with a 401 Unauthorized error. People similar to me that are used to the typical web APIs will expect `fetch()` to use `'same-origin'` instead of the current `'omit'` default. This `'omit'` default seems very odd and unnatural to me next to the other web APIs. As it stands anyone using web authentication will be rejected when using the default `fetch()`.

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