Fix the PIN2 input screen remains while deleting FDN

In the FDN list screen, PIN2 input screen remains even if user completes
PIN2 input after user deletes any number and goes back to PIN2 input
screen and changes device orientation.

PIN2 input screen should be launched only the first time.

Bug: 149452932
Test: manual
Change-Id: I9c618d68d31323527bf3a714fec06ec47d0e716c
1 file changed