Re: [w3c/payment-request] Make "one Payment UI at a time" optional to align with implementations. (#962)

I appreciate what we are trying to do here, but unfortunately, it's not as simple as this. The behavior is more to do with auxiliary browsing contexts (popups) than with "browser tabs".  We can treat pop up windows as their own thing that are allowed to show a payment request. I'll deal with this in the tests instead. 

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