[w3c/ServiceWorker] Fix syntax error in IDL (#1335)

`AbstractWorker` is an `interface mixin`, not an `interface`, so needs to be pull in via `includes` not `implements`.

Found while authoring https://github.com/web-platform-tests/wpt/pull/11960
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1335

-- Commit Summary --

  * Fix syntax error in IDL

-- File Changes --

    M docs/v1/index.bs (2)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1335.patch
https://github.com/w3c/ServiceWorker/pull/1335.diff

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