Fix/33301 form checkbox field

[enejb]

Fixes #33301

Currently when a user is editing the radio buttons or the multi line checkbox and they switch between the different
previews ( mobile, tablet) they end us seeing dots instead of checkboxes or radio buttons.

This is due to the rendering of the styles variables not being set yet.

Proposed changes:

• This PR fixes the issue by setting assigning a default height and width for the checkbox sizes.

Other information:

• Have you written new tests for your changes, if applicable?
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Jetpack product discussion

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Testing instructions:

1. Load up this PR.
2. Add page with a form.
3. Add multi select input ( radio or checkbox or both)
4. Notice that when you toggle between previews ( mobile, tablet ) that the form still looks like expected.

[github-actions]

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[simison]

This is due to the rendering of the styles variables not being set yet.

Do you know why they're not available in editor yet at that point, and should they?

[edanzer]

For radio controls, I confirmed the issue and then confirmed the fix.

For checkboxes, I wasn't able to duplicate the original issue, and I also don't see CSS changes that apply to checkboxes? Should I be seeing checkboxes rendered as dots when on trunk?

For select dropdowns, I see css changes for font size. I assume that's just to reduce the font size on mobile previews (and consistent with the sizing for the other rules updated here).

Approving as everything is working as expected.