[w3c/ServiceWorker] clarify Clients.matchAll() focus order for nested frames (#1080)

`Clients.matchAll()` says to order Clients so most recently focused clients are first in the list.  What does this mean for nested iframes?  Consider:

1. A window with a nested iframe.  The iframe is focused.  In theory both the window and iframe `Client.focused` will be true.  Will they also have the same focus time?
2. A window that is already focused with a nested iframe that is not focused.  The iframe is focused.  Are the focus times for both windows updated or just the iframe?

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https://github.com/w3c/ServiceWorker/issues/1080