[w3c/browser-payment-api] Fix bug in updateWith algorithm that resets shippingOption (#206)

There is a bug in the `updateWith` algorithm for `shippingOption`. If you do not include a new `shippingOptions` sequence in the `details` object then the current shipping option is set to null. This change ensures that the shipping option recalculation is only performed if a new sequence is provided (as originally planned).
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/206

-- Commit Summary --

  * Fix bug in updateWith algorithm that resets shippingOption if you don't provide a new sequence

-- File Changes --

    M specs/paymentrequest.html (45)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/206.patch
https://github.com/w3c/browser-payment-api/pull/206.diff

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