Re: [w3c/browser-payment-api] PaymentDetails "total" member should be required (#320)

@adrianba, I see it's used also in https://w3c.github.io/browser-payment-api/#dom-paymentrequestupdateevent-updatewith, is that the place?

If so, the because the dictionary has no required members it'd have to be made optional in the constructor, even though it'd always throw when emitted. ([`getUserMedia()`](https://w3c.github.io/mediacapture-main/#mediadevices-interface-extensions) is also like this.)

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