'Update MailChimp Profile Info' links incorrectly

[mmtrombl]

The link in the update profile email links incorrectly. This happens on an install where we have an email service (Mailgun) routing emails from the site. The URL in the 'Update MailChimp Profile Info' link references the email domain (in this case, http://email.mg.domain.org/) instead of domain.org or the Mailchimp URL (https://domiain.us7.list-manage.com/), thus prohibiting the user from updating their profile.