Notification 'Briar mailbox is unvailable' should be dismissed when the user taps on it

After linked mailbox becomes unreachable by Briar for a period of time of 5 hours or more, the Briar shows notification that the Briar mailbox is unavailable... see screenshot.

If the user taps on notification they are taken to the mailbox status screen - where they can check connection with mailbox and then go through the troubleshooting algoritm. In troubleshooting, user selects - no access to amilbox, and then unlinks the mailbox

User gets confirmation that the mailbox has been unlinked

But the notification is still there...