[w3c/payment-request] fix: use InvalidStateError for non-fully-active document checks (PR #1056)

Per TAG Design Principles §3.2.2, InvalidStateError should be used for document state issues, while AbortError is reserved for user-initiated aborts.

See: https://www.w3.org/TR/design-principles/#handle-non-fully-active-documents

part of #1040 

The following tasks have been completed:

 * [ ] Modified Web platform tests (link)
 
Implementation commitment:

 * [ ] WebKit (link to issue)
 * [ ] Chromium (link to issue)
 * [ ] Gecko (link to issue)

Optional, impact on Payment Handler spec?


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

  https://github.com/w3c/payment-request/pull/1056

-- Commit Summary --

  * fix: use InvalidStateError for non-fully-active document checks

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/payment-request/pull/1056.patch
https://github.com/w3c/payment-request/pull/1056.diff

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