[w3c/payment-handler] Simplifying functional event handling (#305)

I've simplified event firing as part of https://github.com/w3c/ServiceWorker/pull/1199.

Don't merge this until https://github.com/w3c/ServiceWorker/pull/1199 merges, but you can review now.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/305

-- Commit Summary --

  * Simplifying functional event handling

-- File Changes --

    M index.html (158)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/305.patch
https://github.com/w3c/payment-handler/pull/305.diff

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