Re: [w3c/ServiceWorker] Avoid executing the code in the All Fetch Listeners Are Empty algorithm. (PR #1676)

@annevk @youennf @asutherland This is a change to the "optimise for empty fetch listeners" feature (https://github.com/w3c/ServiceWorker/issues/1671).

Previously, we were looking at both regular listeners, and `{ handleEvent }` listeners. However, running getters during the check adds a bunch of complexity. With this change, the optimisation doesn't apply if there's a non-callable listener object (as in, `{ handleEvent }`).

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