Call finish() when enrollment loses focus

Bug: 134971919

Test: Entering keyguard on any enrollment screen finishes enrollment now
Test: Going back/forward works

Change-Id: I2c80a5586c10fa3feb780a5eadfe203abed52dea

src/com/android/settings/biometrics/face/FaceEnrollIntroduction.java

@@ -77,6 +77,16 @@ public class FaceEnrollIntroduction extends BiometricEnrollIntroduction {
         );
     }
 
+    @Override
+    protected void onStop() {
+        super.onStop();
+
+        if (!isChangingConfigurations() && !mConfirmingCredentials && !mNextClicked
+                && !WizardManagerHelper.isAnySetupWizard(getIntent())) {
+            finish();
+        }
+    }
+
     @Override
     protected boolean isDisabledByAdmin() {
         return RestrictedLockUtilsInternal.checkIfKeyguardFeaturesDisabled(