[w3c/browser-payment-api] Is 'currencySystem' required? (#408)

[The spec says](https://w3c.github.io/browser-payment-api/#paymentcurrencyamount-dictionary):

> The following fields are required:
> `currencySystem`...

However, the WebIDL for `currencySystem` does not have the `required` keyword. Let's change the phrasing of the spec to make it clear that `currencySystem` is optional. The developer could, for example, not specify it, or specify `currencySystem: null` or `currencySystem: undefined`, correct?

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Received on Monday, 23 January 2017 13:53:24 UTC