Fix duplicate license header in AppTest.java

Author: joha1na

src/test/java/de/htw_berlin/fb4/examples/AppTest.java

@@ -18,26 +18,6 @@
  * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
-/*
- * My Prose App - A Java project demonstrating text composition
- * Copyright (c) 2025 Jana Maire
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) 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 General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- * 
- * SPDX-License-Identifier: GPL-3.0-or-later
- */
-
 package de.htw_berlin.fb4.examples;
 
 import static org.junit.Assert.*;