[w3c/payment-handler] PaymentRequestEvent.total (#175)

The [`PaymentRequestEvent.total`](https://w3c.github.io/payment-handler/#dom-paymentrequestevent) is defined to have a type of [`PaymenItem`](https://w3c.github.io/browser-payment-api/#paymentitem-dictionary), which is a dictionary. However, [WebIDL spec](https://heycam.github.io/webidl/#idl-dictionaries) says that attributes should not be dictionaries.

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