[w3c/payment-handler] Only allows instrument.set() in active service worker (#224)

Like other service worker family features, we should only allow
instrument.set() in active service worker.

This fixes #223 issue.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/224

-- Commit Summary --

  * Only allows instrument.set() in active service worker

-- File Changes --

    M index.html (33)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/224.patch
https://github.com/w3c/payment-handler/pull/224.diff

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https://github.com/w3c/payment-handler/pull/224