Forms: fix Single and Multiple Choice fields view styles

[monsieur-z]

Proposed changes:

This PR updates the styles of the Single Choice and Multiple Choice fields so they match in the editor and view.

Editor	View

Ideally, we'd prevent code duplication but that's out of scope here.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

n/a

Does this pull request change what data or activity we track or use?

No.

Testing instructions:

• Spin up a test Jetpack site
• Create a new post
• Add the Single Choice and Multiple Choice fields in a form
• Open the preview
• Notice the fields look like they do in the editor
• Back in the editor, select the Button style from the block sidebar

• Open the preview
• Notice the fields look like they do in the editor

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WordPress.com Simple site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin, and enable the fix/choice-fields-styles branch.

• To test on Simple, run the following command on your sandbox:

  bin/jetpack-downloader test jetpack fix/choice-fields-styles
  

Interested in more tips and information?

• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[github-actions]

Thank you for your PR!

When contributing to Jetpack, we have a few suggestions that can help us test and review your patch:

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[monsieur-z]

Align items in the center in Button mode so the padding looks similar at the top and bottom.

[monsieur-z]

Selector needs to be updated because of #39141

[coder-karen]

This tests well for me! As an aside, I tested with Twenty Twenty (on Jurassic Ninja) while trying different themes and noticed that the text color in the buttons is the same color as the button itself so it doesn't show. However this was the same on trunk too, so not related to this PR.