[w3c/ServiceWorker] [Editorial] Use MessageEvent for ServiceWorkerContainer message and messageerror (PR #1825)

The events table for `ServiceWorkerContainer` listed the `Event` interface
for both the `message` and `messageerror` events, but the `Client.postMessage`
algorithm in §4.5.3 dispatches both events using `MessageEvent` here in https://w3c.github.io/ServiceWorker/#client-postmessage

This PR updates the table to match the algorithm:

- `message`: `Event` → `MessageEvent`
- `messageerror`: `Event` → `MessageEvent`

This PR fixes #1301


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

  https://github.com/w3c/ServiceWorker/pull/1825

-- Commit Summary --

  * fix service-worker-container message events

-- File Changes --

    M index.bs (4)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1825.patch
https://github.com/w3c/ServiceWorker/pull/1825.diff

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