[heycam/webidl] fix: Only install `@@toStringTag` on the prototype (#860)

Supersedes and closes #357

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This matches the behaviour of **Chromium**, **WebIDL2JS** and the pre‑**ES2015** `[[Class]]` internal slot, which is still used in **Firefox** and **WebKit**.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/860


-- Commit Summary --

  * fix: Only install `@@toStringTag` on the prototype

-- File Changes --

    M index.bs (9)

-- Patch Links --

https://github.com/heycam/webidl/pull/860.patch

https://github.com/heycam/webidl/pull/860.diff


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