[w3c/browser-payment-api] Fix shippingType to avoid TypeError (#285)

Fixes #271.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/285

-- Commit Summary --

  * Fix shippingType to avoid TypeError

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/285.patch
https://github.com/w3c/browser-payment-api/pull/285.diff

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https://github.com/w3c/browser-payment-api/pull/285