Make TetherSettings extend RestrictedDashboardFragment

RestrictedSettingsFragment is deprecated and no longer supported. To be
compatible with catalyst, change the super class to
RestrictedDashboardFragment.

Bug: 368359963
Test: atest TetherSettingsTest, manual test with the user restriction
Flag: EXEMPT N/A
Change-Id: If8c5af9d716c63fd33cb508394e7d13450c9d2e7

src/com/android/settings/network/tether/TetherSettings.java

@@ -54,8 +54,8 @@ import androidx.preference.Preference;
 import androidx.preference.TwoStatePreference;
 
 import com.android.settings.R;
-import com.android.settings.RestrictedSettingsFragment;
 import com.android.settings.Utils;
+import com.android.settings.dashboard.RestrictedDashboardFragment;
 import com.android.settings.datausage.DataSaverBackend;
 import com.android.settings.search.BaseSearchIndexProvider;
 import com.android.settings.wifi.tether.WifiTetherPreferenceController;
@@ -75,7 +75,7 @@ import java.util.concurrent.atomic.AtomicReference;
  * Displays preferences for Tethering.
  */
 @SearchIndexable
-public class TetherSettings extends RestrictedSettingsFragment
+public class TetherSettings extends RestrictedDashboardFragment
         implements DataSaverBackend.Listener {
 
     @VisibleForTesting
@@ -143,11 +143,19 @@ public class TetherSettings extends RestrictedSettingsFragment
         super(UserManager.DISALLOW_CONFIG_TETHERING);
     }
 
+    @Override
+    protected String getLogTag() {
+        return TAG;
+    }
+
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.tether_prefs;
+    }
+
     @Override
     public void onCreate(Bundle icicle) {
         super.onCreate(icicle);
-        // Even when the UI is restricted, addPreferencesFromResource cannot be omitted.
-        addPreferencesFromResource(R.xml.tether_prefs);
         setIfOnlyAvailableForAdmins(true);
         if (isUiRestricted()) {
             return;