[w3c/payment-request] fix: retry()'s should be optional per WebIDL (#805)

closes #804 

The following tasks have been completed:

 * [x] Confirmed there are no ReSpec errors/warnings.
 * [x] Modified Web platform tests (auto fixes on next IDL crawl)
 * [ ] Modified MDN Docs (link)

Implementation commitment:

 * [ ] Safari (link to issue)
 * [ ] Chrome (link to issue)
 * [x] Firefox - Our IDL binding layer caught this. 
 * [ ] Edge (public signal)

Optional, Impact on Payment Handler spec?
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/805

-- Commit Summary --

  * fix: retry()'s  should be optional per WebIDL

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/payment-request/pull/805.patch
https://github.com/w3c/payment-request/pull/805.diff

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