Use setting as base activity for fingerprint

Change to use FingerprintSetting as base activity when use launch
"Fingerprint Unlock" from Settings -> Security. And then we can prevent
that necesssary pop-up activites become full-screen.

Bug: 243701933
Bug: 232874879

Test: manual test following cases on fp-only devices, and enable don't
      keep activity and test them again.
      1. fp enrollment on SUW
      2. fp add another on SUW
      3. add first fp on Security Settings
      4. add another fp on Security Settings
Test: atest FingerprintStatusUtilsTest BiometricsSafetySourceTest
Test: robo test for SetupFingerprintEnrollFindSensorTest
      SetupFingerprintEnrollFinishTest
      FingerprintEnrollFindSensorTest FingerprintEnrollEnrollingTest

Merged-In: Ib1c2ef9f93fb910eed2930f871c0c69bdb94bcbd
Change-Id: Ib1c2ef9f93fb910eed2930f871c0c69bdb94bcbd
(cherry picked from commit 84b39c3ed0)

src/com/android/settings/biometrics/fingerprint/FingerprintEnrollEnrolling.java

@@ -339,8 +339,23 @@ public class FingerprintEnrollEnrolling extends BiometricsEnrollEnrolling {
 
     @Override
     protected void onStop() {
-        super.onStop();
+        if (!isChangingConfigurations()) {
+            if (!WizardManagerHelper.isAnySetupWizard(getIntent())
+                    && !BiometricUtils.isAnyMultiBiometricFlow(this)
+                    && !mFromSettingsSummary) {
+                setResult(RESULT_TIMEOUT);
+            }
+            finish();
+        }
         stopIconAnimation();
+
+        super.onStop();
+    }
+
+    @Override
+    protected boolean shouldFinishWhenBackgrounded() {
+        // Prevent super.onStop() from finishing, since we handle this in our onStop().
+        return false;
     }
 
     @Override