[heycam/webidl] fix(`callback interface`): Make `EventListener` into reference (#826)

The definition of `callback interface` lists [`EventListener`](https://dom.spec.whatwg.org/#callbackdef-eventlistener) as what needs it for legacy reasons.

This makes it into a reference, like what other legacy **WebIDL** features do with definitions that need them.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/826


-- Commit Summary --

  * fix(`callback interface`): Make `EventListener` into reference

-- File Changes --

    M index.bs (4)

-- Patch Links --

https://github.com/heycam/webidl/pull/826.patch

https://github.com/heycam/webidl/pull/826.diff


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