fix(recaptcha): remove modal checkout restriction from v2

[chickenn00dle]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Does your code follow the WordPress' coding standards and VIP Go coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Closes https://app.asana.com/0/1200550061930446/1209016713141551/f

This PR removes the restriction for modal-checkout from v2 recaptcha, and ensures the necessary captcha logic triggers on woo checkout form.

How to test the changes in this Pull Request:

1. Enable v2 recaptcha as admin and ensure threshold is at maximum via Google's recaptcha dashboard
2. As a reader go through regular woo checkout and verify recaptcha triggers and can be completed successfully
3. Now go through modal checkout and verify nothing has broken there.
4. Repeat the above steps for:
   • Recaptcha v3
   • Recaptcha disabled

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

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[matticbot]

🎉 This PR is included in version 5.11.1 🎉

The release is available on GitHub release

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