[heycam/webidl] Switch to highlight="webidl" for dictionary defaulting example (#754)

The example added in https://github.com/heycam/webidl/pull/750 doesn't use `highlight="webidl"`, because bikeshed can't handle it yet.  Once https://github.com/tabatkins/bikeshed/issues/1491 is fixed, we should change that.

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Received on Monday, 1 July 2019 16:37:12 UTC