[form-group]: incorrect styling for radio and submit buttons

[kennylam]

The radio button styles are missing right margin spacing and the submit button is the wrong width (shouldn't be 100% of the container.

Originally posted by @kennylam in #11361 (comment)

[m4olivei]

Are radio buttons broken on v2? I'm looking here, and they look OK to me:

https://carbon-design-system.github.io/carbon-for-ibm-dotcom/v2/carbon-web-components-v2/?path=/story/components-radio-button--default

I think my comment in the SB v7 PR, was due to the feat/cwc-storybook-7-vite branch being behind main, not that the style was broken on main.

[kennylam]

Radio buttons look fine in main yeah. I just put it in this issue to double check once the SB7 work gets merged in.