[w3c/payment-handler] Replace 'enabledMethods' array with 'method' string. (#276)

(Also be more consistent with ' vs ".)

The following tasks have been completed:
 * [x] [web platform tests](https://github.com/w3c/web-platform-tests/pull/10180)

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/276

-- Commit Summary --

  * Replace 'enabledMethods' array with 'method' string.

-- File Changes --

    M index.html (91)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/276.patch
https://github.com/w3c/payment-handler/pull/276.diff

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