[w3c/payment-handler] Replace void with undefined in Web IDL (#384)

See https://github.com/heycam/webidl/pull/906.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/384

-- Commit Summary --

  * Replace void with undefined in Web IDL

-- File Changes --

    M index.html (10)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/384.patch
https://github.com/w3c/payment-handler/pull/384.diff

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