[w3c/payment-handler] Return null after the window is opened instead of reject with 'SecurityError' (#202)

In the openWindow algorithm 14.1, the window is opened at that point, looks make no sense to reject with "SecurityError". 

This is also how Clients.openWindow works for service work.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/202

-- Commit Summary --

  * return null

-- File Changes --

    M index.html (3)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/202.patch
https://github.com/w3c/payment-handler/pull/202.diff

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