fix: add padding to cart items in order complete page

[willopez]

Resolves #334
Impact: minor
Type: bugfix

Summary

Add padding to cart items in order complete page.

Testing

1. Verify cart items have padding, compare with designs.

[nnnnat]

The CI test is failing, possibly just needs snapshot updated

[nnnnat]

@willopez Looking at the code change I think this is fine to merge, I've been unable to test it locally because I keep running into a Cannot read property 'card' of undefined error when trying to check out. Deff a problem with my setup I'm going to restart and test again but if you want to merge I think it's good2go.

[willopez]

@nnnnat that error will occur when you don't have a stripe token, which in turn means that you might not have the stripe API keys configured in reaction + staterkit https://github.com/reactioncommerce/reaction-next-starterkit#set-up-stripe

[nnnnat]

@willopez haha yeah I had Stripe set up in RC but not the starterkit. Was able to test locally looks good!