Restore remote handshake link when AddContactViewModel gets destroyed
Test instructions:
- enable "don't keep activities" at the end of the phone's developer options (in system settings)
- go to add contact at a distance
- enter someone's link, press continue, enter nickname
- press the home button
- relaunch briar from recent apps
- ensure that the pending contact was added and briar didn't crash
Closes #1910 (closed)
Edited by Torsten Grote