Describe the bug

In #29 we moved the Mailchimp settings page to be top-level and added the Freddie icon to that menu. In reviewing today, it was noted that the Freddie icon used was inverted, so we'll want to get that updated to the right one

Steps to Reproduce

View the Mailchimp menu item and note the icon is inverted in it's color scheme

Screenshots, screen recording, code snippet

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Environment information

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WordPress information

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Code of Conduct

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