[LE Broadcast] Fix crash when scan QR code

Crash happens when rotated screen.

QrCodeScanModeFragment should only have default constructor.

Remove unused params to fix.

To start this page,
adb shell am start \
    -a android.settings.BLUETOOTH_LE_AUDIO_QR_CODE_SCANNER

Fix: 287363885
Test: Manually
Change-Id: I3c4bcfdb8ae6ddf750e16d8e7565cb9d45d11788

src/com/android/settings/bluetooth/QrCodeScanModeActivity.java

@@ -98,7 +98,7 @@ public class QrCodeScanModeActivity extends QrCodeScanModeBaseActivity {
                         BluetoothBroadcastUtils.TAG_FRAGMENT_QR_CODE_SCANNER);
 
         if (fragment == null) {
-            fragment = new QrCodeScanModeFragment(mIsGroupOp, mSink);
+            fragment = new QrCodeScanModeFragment();
         } else {
             if (fragment.isVisible()) {
                 return;

src/com/android/settings/bluetooth/QrCodeScanModeFragment.java

@@ -18,7 +18,6 @@ package com.android.settings.bluetooth;
 
 import android.app.Activity;
 import android.app.settings.SettingsEnums;
-import android.bluetooth.BluetoothDevice;
 import android.content.Context;
 import android.content.Intent;
 import android.graphics.Matrix;
@@ -71,9 +70,7 @@ public class QrCodeScanModeFragment extends InstrumentedFragment implements
 
     public static final String KEY_BROADCAST_METADATA = "key_broadcast_metadata";
 
-    private boolean mIsGroupOp;
     private int mCornerRadius;
-    private BluetoothDevice mSink;
     private String mBroadcastMetadata;
     private Context mContext;
     private QrCamera mCamera;
@@ -81,11 +78,6 @@ public class QrCodeScanModeFragment extends InstrumentedFragment implements
     private TextView mSummary;
     private TextView mErrorMessage;
 
-    public QrCodeScanModeFragment(boolean isGroupOp, BluetoothDevice sink) {
-        mIsGroupOp = isGroupOp;
-        mSink = sink;
-    }
-
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);