Re: [w3c/payment-handler] Change openWindow algorithm 14.1 to 'Resolve promise with null.' (#201)

It should not be a cross origin window. It should be opening a window to the same origin that the service worker is running in.

If the window opens an origin that isn't the same as the service worker's then a `"SecurityError" DOMException` is thrown ([see step 14 of the open window algorithm](https://w3c.github.io/payment-handler/#dfn-open-window-algorithm)).

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