[w3c/payment-request] fix: disallow duplicate PMIs when created request (#908)

closes #905

The following tasks have been completed:

 * [X] Confirmed there are no ReSpec errors/warnings.
 * [ ] Modified Web platform tests (link)
 * [ ] Modified MDN Docs (link)
 * [ ] Has undergone security/privacy review (link)
 
Implementation commitment:

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

Optional, impact on Payment Handler spec?

None. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/908

-- Commit Summary --

  * fix: disallow duplicate PMIs when created request

-- File Changes --

    M index.html (17)

-- Patch Links --

https://github.com/w3c/payment-request/pull/908.patch
https://github.com/w3c/payment-request/pull/908.diff

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