Select one default shipping option

[dtchanpura]

Problem

In dark mode while doing a checkout on store.elementary.io it looked like a bullet point I kept on getting error message as "Please fill out the form". (screenshot below)

The reason was that I did not select the only shipping option available, as it did not look like a radio button.

Proposal

If there are no other options in a radio button scenario only one should be checked, and in case of multiple first one can be a good option to with.

Quick browsing on the code shows the fix may include adding checked: true here, but I don't have much experience with Elixir so cannot be sure.

Prior Art

I could not find any examples.