Contact list is shown when opening app during DB migration
Steps to reproduce:
- Use the long-migration branch, which adds a fake 60-second DB migration at every startup
- Sign into Briar
- While the fake migration is running, send Briar to the background or turn the screen off
- Relaunch Briar from the status bar or lock screen notification (on some Android versions this requires opening the notification drawer)
- Expected: The migration screen is shown
- Actual: The contact list is shown with a progress wheel. The nav drawer can be opened. Backing out of the contact list or signing out via the nav drawer shows the migration screen again