Update preference screen title.

- Add missing title to preference screen xml so that they will be used to
set the activity title when the fragment is launched.
- Also updated some incorrect preference screen titles.
- Overrides getTitle() in preference fragments that do not use the
preference screen xml.

Bug: 64564191
Test: blaze-bin/screenshots/android/i18nscreenshots/i18nscreenshots
Change-Id: Id72d5ddf18f0962bc484de8bbd847a2e55d6371e

src/com/android/settings/applications/defaultapps/DefaultAutofillPicker.java

@@ -18,9 +18,7 @@ package com.android.settings.applications.defaultapps;
 
 import android.Manifest;
 import android.app.Activity;
-import android.app.Dialog;
 import android.content.ComponentName;
-import android.content.ContentResolver;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
@@ -30,7 +28,6 @@ import android.content.pm.ServiceInfo;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
-import android.os.Looper;
 import android.provider.Settings;
 import android.service.autofill.AutofillService;
 import android.service.autofill.AutofillServiceInfo;
@@ -105,6 +102,11 @@ public class DefaultAutofillPicker extends DefaultAppPickerFragment {
         }
     }
 
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.default_autofill_settings;
+    }
+
     @Override
     public int getMetricsCategory() {
         return MetricsProto.MetricsEvent.DEFAULT_AUTOFILL_PICKER;