Re: [w3c/payment-request] If requestShipping is false, pr.shippingOption should be null (#609)

To be clear:

```JS
ev.updateWith({
   // updating with new shipping options would leave pr.shippingOption === "never-selected" 
   shippingOptions: [{id: "THIS_IS_NEVER_SELECTED" , selected: true}]
});
```


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