Set appropriate theme for SkipFingerprintDialog

The SkipFingerprintDialog is instantiation in
SetupFingerprintEnrollFindSensor#onSkipButtonClick()

Due to the call flow did not set appropriate theme
defined in setuplib for skip alertDialog instance
we set GlifV2ThemeAlertDialog AlertDialog.Builder.

Test: m RunSettingsRoboTests -j30 ROBOTEST_FILTER= \
      SetupFingerprintEnrollFindSensorTest
Test: manual factory reset, go through SUW, and check
      skip AlertDialog Bottom Bar Buttons visual.
Bug: 233243999
Change-Id: Ic198a23eb3e76d70e287b24f2ab1ef249b30b2fc