Fix/form textarea default border stylinig

[enejb]

This Pr fixes the default contact form missing textarea border when it first loaded. The border would eventually show up.

This PR make it so that the border is always there by default.

Before:

After:

Proposed changes:

• It adds a default variable set for the css variables when these value are set to undefined.
• The default values are the same as the one define in the previous css rule.

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

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

Testing instructions:

• Load up this PR.
• Use the twenty twenty five theme and go to the editor.
• Add the jetpack form block.
• Add the contact form.
• Notice that the text area had a border right away.

[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/form-textarea-default-border-stylinig branch.

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

  bin/jetpack-downloader test jetpack fix/form-textarea-default-border-stylinig
  

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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This comment will be updated as you work on your PR and make changes. If you think that some of those checks are not needed for your PR, please explain why you think so. Thanks for cooperation 🤖

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Follow this PR Review Process:

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Jetpack plugin:

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• WordPress.com Simple releases happen semi-continuously (PCYsg-Jjm-p2).
• WoA releases happen weekly.
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[lezama]

not sure what's the right solution but 🤷 🚢