[heycam/webidl] Permit [SameObject] for nullable types? (#559)

WebAuthn made a previously-[SameObject] attribute userHandle nullable (in https://github.com/w3c/webauthn/commit/3b2a1d141cbd8f2954f073a6b6598d954398a986). @smaug---- points out that ["SameObject applies to interface and objects only, not nullable types"](https://phabricator.services.mozilla.com/D1337#inline-5985) but since this sort of makes sense, perhaps WebIDL should change to permit the behavior.

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