[w3c/payment-request] Make "one Payment UI at a time" optional to align with implementations. (#962)

The following tasks have been completed:

 * [ ] 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)

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

  https://github.com/w3c/payment-request/pull/962

-- Commit Summary --

  * Make "one Payment UI at a time" optional to align with implementations.

-- File Changes --

    M index.html (71)

-- Patch Links --

https://github.com/w3c/payment-request/pull/962.patch
https://github.com/w3c/payment-request/pull/962.diff

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