Avoiding the mess with saving onSaveInstanceState, and the (in this
case) unwanted restoring of it upon back-button tap.
Closes#1919
Test instructions:
- Precondition: fresh install, setting up a new account
- Testing specific bug fix:
- Choose a name, tap next
- Choose a password, tap next
- Not testable on some devices which display "Create account" instead of "Next"
- You are now on Background connections screen
- Tap Back-button ◁
- Ensure that password can be changed again
- During setup process, rotate device and ensure that:
- entered text is kept
- progressbar is continuously displayed