[w3c/ServiceWorker] Editorial: "Update Service Worker Extended Events Set" minor fix (PR #1813)

The "Update Service Worker Extended Events Set" algorithm stores the input event into the "set of extended events", which is defined as a set of ExtendableEvent objects. To be consistent with this definition and how the algorithm is called (always with ExtendableEvent or its subclasses), this change updates the input type from Event to ExtendableEvent.

Bug: #1196


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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1813

-- Commit Summary --

  * Editorial: Update input type of "Update Service Worker Extended Events Set" to ExtendableEvent

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1813.patch
https://github.com/w3c/ServiceWorker/pull/1813.diff

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