[w3c/payment-request] fix: give dictionary member sensible defaults (#781)

*closes #780

The following tasks have been completed:

 * [x] Confirmed there are no ReSpec errors/warnings.
 * [ ] Modified Web platform tests (link)
 * [ ] Modified MDN Docs (link)

Implementation commitment:

 * [ ] Safari (link to issue)
 * [ ] Chrome (link to issue)
 * [x] [Firefox](https://bugzilla.mozilla.org/show_bug.cgi?id=1368949)
 * [ ] 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/781

-- Commit Summary --

  * fix: give dictionary member sensible defaults

-- File Changes --

    M index.html (8)

-- Patch Links --

https://github.com/w3c/payment-request/pull/781.patch
https://github.com/w3c/payment-request/pull/781.diff

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