[w3c/payment-request] Update test-plan.md after web-platform-tests repo move (#725)

Part of https://bit.ly/wpt-transition.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/725

-- Commit Summary --

  * Update test-plan.md after web-platform-tests repo move

-- File Changes --

    M test-plan.md (27)

-- Patch Links --

https://github.com/w3c/payment-request/pull/725.patch
https://github.com/w3c/payment-request/pull/725.diff

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