[w3c/payment-handler] Chore: internal slot syntax changes (#394)

In light of:
https://lists.w3.org/Archives/Public/spec-prod/2021AprJun/0030.html

(This may not work yet, but happy to push and get help.)
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/394

-- Commit Summary --

  * Chore: internal slot syntax changes

-- File Changes --

    M index.html (12)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/394.patch
https://github.com/w3c/payment-handler/pull/394.diff

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