Connect bug fixes

Here's two bug fixes we recently pushed:

Mailgun channel unable to be added
- We’ve fixed the ability to add a new Mailgun email channel to your Vero account, which was presenting an error. This issue was only present for a short time and did not affect existing channels.
Can’t close billing modal
- Fixed a bug causing the full screen billing UI to stay open after adding new card details or when trying to exit using the close button.