[w3c/payment-handler] Update Open Window Algorithm (#321)

It seems the Payment Handler Open Window Algorithm (6.1) is no longer in sync with the Service Worker openWindow(url) algorithm. 

After discussion with @rsolomakhin we propose to update the Payment Handler algorithm to align with the Service Worker algorithm, with the additional constraint that the user not be able to navigate away from the focused payment handler window to the context where Payment Request API was called. 

Because this SW algorithm assigns focus to the newly opened window, this answers the question of issue #307 and so I will close that issue, subsumed by this one.

Ian

https://w3c.github.io/ServiceWorker/#clients-openwindow

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