Add divider line in Preference for scan QR code button and share hotspot button

Use com.android.settingslib.R.layout.preference_two_target in
WifiTetherSsidPreference to add divider line.

Bug: 128940862
Test: manual test
Change-Id: I46dabcee31a91b68b8c2e57c9840a59f8a1be304

src/com/android/settings/wifi/AddWifiNetworkPreference.java

@@ -20,7 +20,6 @@ import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.drawable.Drawable;
 import android.util.Log;
-import android.view.View;
 import android.widget.ImageButton;
 
 import androidx.annotation.DrawableRes;
@@ -63,10 +62,6 @@ public class AddWifiNetworkPreference extends Preference {
                 getContext().startActivity(
                     WifiDppUtils.getEnrolleeQrCodeScannerIntent(/* ssid */ null));
             });
-
-            final View divider = (View) holder.findViewById(
-                    com.android.settingslib.R.id.two_target_divider);
-            divider.setVisibility(View.INVISIBLE);
         }
     }