Only launchHandoffToParent in SUW

Settings flow does not need to show this screen

Fixes: 192586840
Test: adb shell am start -a android.settings.BIOMETRIC_ENROLL --ez require_consent true --ez skip_return_to_parent <true/false>
Test: adb shell am start -a android.settings.BIOMETRIC_ENROLL --ez require_consent true
Test: atest com.android.settings.biometrics.ParentalConsentHelperTest

Change-Id: Ic2edbb5ec9693d05c89206d49249f59fd968aa2f