Re: [w3c/ServiceWorker] Does changing updateViaCache mint a new ServiceWorkerRegistration or update them all? (#1189)

We only just recently landed this in firefox nightly.  There I think you will get:

```
var reg = await navigator.serviceWorker.getRegistration(url);
reg.updateViaCache;  // 'all';
var r = await register(sw, {updateViaCache: 'none'});
reg === r;  // false
reg.updateViaCache; // 'all'
r.updateViaCache; // 'none'
```

I think this behavior is determined by step 5.3 here in the spec:

https://w3c.github.io/ServiceWorker/#register-algorithm

You should skip the short-circuit because the cache mode is different and get a new registration.

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