[w3c/browser-payment-api] Should PaymentResponse include totalAmount and if so must it be one of the supplied totals (#215)

PR #211 introduced the idea of including the `totalAmount` in the `PaymentResponse`. The idea is that since different totals can be provided using `PaymentDetails.total` and `PaymentDetailsModifier.total` then the user agent should include which one was chosen in the response.

There was some discussion of this on the telcon today.

I think there are three options to consider:

1. Leave the spec as is; or
2. Remove `totalAmount` from `PaymentResponse`; or
3. Leave `totalAmount` but remove the text that requires that the value be one of the provided totals.

My preference is (1) or (2). I don't mind which.

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