[w3c/payment-handler] Fix a example for PaymentManager.requestPermission(). (#199)

Although PaymentManager.requestPermission is defined as static method, its
example is using the service worker registration's paymentManager instance.
It's better to use the static method in the example if possible.

This PR is fixing #198 issue.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/199

-- Commit Summary --

  * Fix a example for PaymentManager.requestPermission().

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/199.patch
https://github.com/w3c/payment-handler/pull/199.diff

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