Re: [w3c/browser-payment-api] Change the value of currencySystem to an enum (#521)

```JS
// Real money
const dollars = {
    currency: "USD" ,
    value: "100000000.00",
    currencySystem: "ISO427", 
};

// Mickey Mouse Money(TM)
const mickeys = {
    currency: "MMM",
    value: "0.01",
    currencySystem: "https://disney.com/mickey/mouse/money",
};
```


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