[whatwg/webidl] setlike.add() is meant to return the setlike. Fixes #1268 (PR #1269)

In #1138 I accidentally made setlike's add() return the added value, like delete(). It originally returned the setlike itself. This PR returns the spec to the original behavior.

skipping the checklist since this is just returning the spec's behavior to how it was before the #1138 PR, which was not *intended* to change this aspect.

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/webidl/pull/1269

-- Commit Summary --

  * setlike.add() is meant to return the setlike. Fixes #1268

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1269.patch
https://github.com/whatwg/webidl/pull/1269.diff

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