Add missing copyright header

android/java/res/layout/fragment_fingerprint_unlock.xml

@@ -1,4 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--* Copyright (c) 2024 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. -->
 <androidx.core.widget.NestedScrollView
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"