Add license header and remove duplicate empty lines

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

src/test/java/com/owncloud/android/authentication/AuthenticatorUrlUtilsTest.java

@@ -1,3 +1,23 @@
+/*
+ *   Nextcloud Android client application
+ *
+ *   @author Chris Narkiewicz
+ *   Copyright (C) 2021 Chris Narkiewicz
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+ *   License as published by the Free Software Foundation; either
+ *   version 3 of the License, or any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU AFFERO GENERAL PUBLIC LICENSE for more details.
+ *
+ *   You should have received a copy of the GNU Affero General Public
+ *   License along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+ 
 package com.owncloud.android.authentication;
 
 import org.junit.Assert;
@@ -74,6 +94,4 @@ public class AuthenticatorUrlUtilsTest {
             Assert.assertEquals("", normalized);
         }
     }
-
-
 }