[w3c/browser-payment-api] Editorial: use new language for DOMExceptions (#375)

E.g. `"InvalidStateError" DOMException` instead of just `InvalidStateError`. See https://github.com/heycam/webidl/pull/250 and the new prose at https://heycam.github.io/webidl/#dfn-create-exception

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https://github.com/w3c/browser-payment-api/issues/375