Fix LYS badge override

[ilyasfoo]

Changes proposed in this Pull Request:

Closes https://github.com/Automattic/wc-calypso-bridge/issues/1516

This PR fixes LYS badge style overridden by default admin color scheme.

I used nav-unification.css because I didn't want to add a new globally-loaded CSS for a mere couple lines fix.

Before

After

How to test the changes in this Pull Request:

1. Use a WPCOM atomic e-commerce site
2. Enable LYS feature flag (you can set these lines to true).
3. Go to /wp-admin/profile.php
4. Select Default admin color scheme and click Update Profile
5. Hover the LYS badge
6. Observe that it does not have a black background color
7. Go to Settings > WooCommerce > Site visibility
8. If it was Live, set to Coming soon, and vice versa. Click Save changes
9. Hover the LYS badge
10. Observe that it does not have a dark background color

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?

FOR PR REVIEWER ONLY:

• [ ] I have reviewed that everything is sanitized/escaped appropriately for any SQL or XSS injection possibilities. I made sure Linting is not ignored or disabled.

[github-actions[bot]]

Size Change: 0 B

Total Size: 201 kB

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `./build/53.js` | 1.08 kB | | `./build/index.css` | 878 B | | `./build/index.js` | 126 kB | | `./build/marketing.js` | 58.3 kB | | `./build/payment-gateway-suggestions.css` | 1.24 kB | | `./build/payment-gateway-suggestions.js` | 6.57 kB | | `./build/plugins.js` | 3.93 kB | | `./build/style-index.css` | 2.15 kB | | `./build/style-marketing.css` | 800 B |

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