[w3c/payment-request] remove currencySystem member (#694)

closes #617

The following tasks have been completed:

 * [x] Confirmed there are no ReSpec errors/warnings.
 * [ ] Removed web platform tests (link)


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

  https://github.com/w3c/payment-request/pull/694

-- Commit Summary --

  * test: show() triggered by user activation
  * Remove currencySystem

-- File Changes --

    M index.html (53)

-- Patch Links --

https://github.com/w3c/payment-request/pull/694.patch
https://github.com/w3c/payment-request/pull/694.diff

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https://github.com/w3c/payment-request/pull/694