[w3c/payment-request] fix: close request if sheet is showing (#821)

closes #820

The following tasks have been completed:

 * [x] Confirmed there are no ReSpec errors/warnings.
 * [ ] Modified Web platform tests (link)
 * [x] Modified MDN Docs - not needed. 
 * [x] Has undergone security/privacy review - bug fix. Not needed.
 
Implementation commitment:

 * [ ] Safari - @aestes, please provide link 🙏. 
 * [x] Chrome - current behavior. 
 * [x] Firefox - current behavior.
 * [ ] Edge - @zouhir - please confirm 🙏. 

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/821


-- Commit Summary --

  * fix: close request if sheet is showing

-- File Changes --

    M index.html (10)

-- Patch Links --

https://github.com/w3c/payment-request/pull/821.patch

https://github.com/w3c/payment-request/pull/821.diff


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