Revert "Disallow screenshot on Wi-Fi QR code settings"

This reverts commit 950837b20f.

Reason for revert: The security issue is downgraded to NSI, remove the screenshot protection to rollback the original design.

Change-Id: Iecaf7e4e19dc3452a7d2aeaf32bf38619e760c76

src/com/android/settings/wifi/dpp/WifiDppConfiguratorActivity.java

@@ -28,7 +28,6 @@ import android.os.UserManager;
 import android.provider.Settings;
 import android.util.EventLog;
 import android.util.Log;
-import android.view.WindowManager;
 
 import androidx.annotation.VisibleForTesting;
 import androidx.fragment.app.FragmentTransaction;
@@ -100,7 +99,6 @@ public class WifiDppConfiguratorActivity extends WifiDppBaseActivity implements
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
 
         if (savedInstanceState != null) {
             String qrCode = savedInstanceState.getString(KEY_QR_CODE);