[w3c/payment-request] Editorial: use new IDL constructor syntax (#880)

closes #878 

The following tasks have been completed:

 * [X] Confirmed there are no ReSpec errors/warnings.
 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/880

-- Commit Summary --

  * refactor: use new WebIDL constructor syntax
  * Editorial: use new IDL constructor syntax

-- File Changes --

    M index.html (63)

-- Patch Links --

https://github.com/w3c/payment-request/pull/880.patch
https://github.com/w3c/payment-request/pull/880.diff

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