[w3c/payment-handler] Trying to get a non-existing value is not exceptional (#230)

In `PaymentInstruments.get()` method

It states:
> Otherwise, reject p with a DOMException whose value is "NotFoundError".

This is ideal, as trying to get something that might no longer be there is not "exceptional". It should just resolve with `undefined`. 


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https://github.com/w3c/payment-handler/issues/230