fix: make dropcap style more specific

[laurelfulford]

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:

WordPress 6.9 changed how some block styles are loaded - they're only loaded when you need them. This is having a weird side effect on the drop cap style, since the core style are now overriding our theme's.

This PR fixes that; unfortunately it also makes our theme styles a little more specific. Hopefully this doesn't have any weird side effects but there's a small chance it'll cause issues on sites that are overriding those styles with something else in the Custom CSS.

How to test the changes in this Pull Request:

1. On a site running WP 6.9, add a paragraph and enable the drop cap. Publish.
2. View on the front-end - it's huge compared to the editor.
3. Apply this PR.
4. Confirm that the drop cap now matches on the front and back end.

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?

[matticbot]

🎉 This PR is included in version 2.15.2 🎉

The release is available on GitHub release

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