SystemUI: biometrics: Follow user setting to confirm face unlock

* It seems that AOSP code migration has some pending clean up
  which creates issue of not honoring setConfirmationRequired(false)
  for biometric prompt.
* Let's disregard app setting and follow only user setting whether or
  not confirm face unlock prompt is required.

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>