[w3c/ServiceWorker] Set default value of optional dictionary to {} (#1448)

heycam/webidl#750 introduces the change that use `{}` as default value for optional dictionaries.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1448

-- Commit Summary --

  * Set default value of optional dictionary to {}

-- File Changes --

    M docs/index.bs (22)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1448.patch
https://github.com/w3c/ServiceWorker/pull/1448.diff

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