fix(ia): newsletters component for the setup wizard

[miguelpeixe]

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:

1205919985867982-as-1209354311969241

Fixes the Newsletters settings component import for the setup wizard.

How to test the changes in this Pull Request:

1. While on the epic/ia branch, navigate to the /wp-admin/admin.php?page=newspack-setup-wizard#/services page
2. Toggle "Newsletters" on and confirm the fatal js error
3. Checkout this branch and refresh the page
4. Toggle "Newsletters" on and confirm you are able to configure and continue

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?