Fix incorrect choose screen lock during unicorn

ChooseLockGeneneric uses intent extra key to determine correct strings
on "Choose screen lock" screen.

Bug: 219419005
Test: atest BiometricEnrollActivityTest
Test: Manully test SUW as following combinations
      1. W/ unicorn flow or W/O unicorn flow
      2. Fingerprint only devices or Fingerpirnt+Face devices
Change-Id: I2abf9555676f3fb3b92dd6ddcc091ea8158bfe9f