[w3c/payment-handler] Inconsistent DOMException styles (#267)

> with a DOMException whose value "OperationError"

> a DOMException whose value is "InvalidStateError"

> throw an "InvalidStateError" DOMException

> promise with a DOMException whose name is "InvalidStateError"

> return a Promise rejected with a NotAllowedError. 

The correct style these days is `"OperationError" DOMException`.

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