[w3c/ServiceWorker] [Editorial] Use ExtendableMessageEvent for messageerror (minor fix) (PR #1814)

[3.1.4](https://w3c.github.io/ServiceWorker/#service-worker-postmessage) in the spec already uses ExtendableMessageEvent for messageerror. This PR updates messageerror from MessageEvent to the ExtendableMessageEvent  in the  ServiceWorkerGlobalScope table

Bug: [1193](https://github.com/w3c/ServiceWorker/issues/1193)


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

  https://github.com/w3c/ServiceWorker/pull/1814

-- Commit Summary --

  * update messageerror t use ExtendableMessageEvent

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1814.patch
https://github.com/w3c/ServiceWorker/pull/1814.diff

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