[w3c/payment-request] fix: dispatch must set [[waitForUpdate]] to true (#855)

closes #854

The following tasks have been completed:

 * [x] Confirmed there are no ReSpec errors/warnings.
 * [ ] [Modified Web platform tests](https://w3c-test.org/payment-request/PaymentRequestUpdateEvent/updateWith-call-immediate-manual.https.html)
 
Implementation commitment:

 * [ ] Safari (link to issue)
 * [ ] Chrome (link to issue)
 * [x] Firefox - already implements 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/855

-- Commit Summary --

  * fix: dispatch must set [[waitForUpdate]] to true

-- File Changes --

    M index.html (3)

-- Patch Links --

https://github.com/w3c/payment-request/pull/855.patch
https://github.com/w3c/payment-request/pull/855.diff

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