[heycam/webidl] Allow to use LegacyNullToEmptyString on USVString. (#915)

This is needed for the CSSOM spec, as that allows to use USVString as
the underlying string type.

Given the USVString conversion to JS values is already calling into the
DOMString conversion, there's no need to modify that section even, which
is great.

cc https://github.com/w3c/csswg-drafts/issues/5010
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/915

-- Commit Summary --

  * Allow to use LegacyNullToEmptyString on USVString.

-- File Changes --

    M index.bs (8)

-- Patch Links --

https://github.com/heycam/webidl/pull/915.patch
https://github.com/heycam/webidl/pull/915.diff

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