[w3c/payment-handler] Ran tidy with tidyconfig.txt (#348)

I ran:
```console
tidy -config ./tidyconfig.txt -o ~/tidy.html ./index.html
vimdiff ~/tidy.html ./index.html
cp ~/tidy.html ./index.html
```
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/348

-- Commit Summary --

  * Ran tidy with tidyconfig.txt

-- File Changes --

    M index.html (4182)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/348.patch
https://github.com/w3c/payment-handler/pull/348.diff

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