Re: [w3c/ServiceWorker] async waitUntil microtask issue (#1213)

The dispatch flag is unset after all event listeners are invoked, according to https://dom.spec.whatwg.org/#dispatching-events:
1. the dispatch flag is set at step 1 and is unset and step 14.
2. the listener callbacks could be invoked in step 12.4 and step 13.6.
3. in https://dom.spec.whatwg.org/#concept-event-listener-inner-invoke, each callback invocation [1] (step 16.2 of [1]) contains a microtask checkpoint specified in [2].
[1] https://heycam.github.io/webidl/#call-a-user-objects-operation
[2] https://html.spec.whatwg.org/multipage/webappapis.html#clean-up-after-running-script

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