Tapping notification creates duplicate instance of status screen

Steps to reproduce:

• Start the Mailbox app and pair it with Briar
• While the status screen is in the foreground, pull down the notification drawer and tap the Mailbox app's ongoing notification
• Close the notification drawer
• Tap the Stop button in the status screen
• Expected: The app closes
• Actual:
  • The status screen closes, revealing another status screen underneath
  • The stop button in the second status screen does nothing