[w3c/ServiceWorker] Reloading page causes one extra client on client list (#972)

I've placed the below code on SW root for testing `matchAll` with a page reload.
```
clients.matchAll({includeUncontrolled: true, type: 'window'}).then(list => console.log(list)); //2 clients printed, it should be one, right?
```
It output 2 clients while there was only one opening page. The terminated one seem to still be kept on the list. Is that a bug? Or is there any property for indicating a closed one?

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