[w3c/payment-request] Editorial: use different global (PR #997)

closes #994 

We can use the "this"'s relevant global object instead. Also found us a bonus bug. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/997

-- Commit Summary --

  * Editorial: use different global

-- File Changes --

    M index.html (16)

-- Patch Links --

https://github.com/w3c/payment-request/pull/997.patch
https://github.com/w3c/payment-request/pull/997.diff

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