[w3c/payment-request] fix: unknown currencySystem throws (#689)

closes #686

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

  https://github.com/w3c/payment-request/pull/689

-- Commit Summary --

  * fix: unknown currencySystem throws

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/payment-request/pull/689.patch
https://github.com/w3c/payment-request/pull/689.diff

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