Re: [w3c/payment-request] Drop prefixes, suffixes from error field members (#745)

@domenic, we need to keep `shippingAddressErrors` on `PaymentDetailsUpdate`, otherwise it would be weird... but chopped the rest:

```JS
dictionary PaymentDetailsUpdate : PaymentDetailsBase {
  DOMString error;
  PaymentItem total;
  AddressErrorFields shippingAddressErrors;
};
```

Gecko bug https://bugzilla.mozilla.org/show_bug.cgi?id=1473081

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