Increase padding and font size for tile checkbox

[aduth]

Related: 18F/identity-idp#5279 (review)
Slack discussion: https://gsa-tts.slack.com/archives/C01JVKYE4KD/p1628869289001500

Implements padding and font size for tile variants of checkbox and radio buttons to align to Figma designs.

Screenshots:

Before	After

Live Preview:

• Before: https://design.login.gov/components/form-fields/#tile
• After: https://federalist-2f194a10-945e-4413-be01-46ca6dae5358.app.cloud.gov/preview/18f/identity-style-guide/aduth-check-tile-padding/components/form-fields/#tile

[zachmargolis]

Visually, the padding looks a little too big to me? But if it matches the designs that's good enough for me 👍

[aduth]

Visually, the padding looks a little too big to me? But if it matches the designs that's good enough for me 👍

Yeah, there was some prior discussion about this on Slack. I'll defer to @anniehirshman-gsa or @cdelivuk on the final call, since maybe it makes a difference to see it "live". One thing I'll note is that it might appear a bit excessive in the examples only because there's not much supporting text, whereas in the real world we'll typically have a longer description.

For example:

[anniehirshman-gsa]

Looks good to me, and yes, padding now matches design system Figma. I agree it's especially helpful to have when there is a larger block of text.