[w3c/payment-handler] Delete instrument key from PaymentRequestEvent (#393)

closes #391 

The following tasks have been completed:

 * [ ] web platform tests (link)
 * [ ] MDN Docs added (link)

Implementation commitment:

 * [ ] Safari (link to issue)
 * [ ] Chrome (link to issue)
 * [ ] Firefox (link to issue)
 * [ ] Edge (public signal)


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

  https://github.com/w3c/payment-handler/pull/393

-- Commit Summary --

  * delete instrument key per issue 391

-- File Changes --

    M index.html (28)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/393.patch
https://github.com/w3c/payment-handler/pull/393.diff

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