all: move description of C files below the copyright and license

tests/unit/plugins/trigger/test-trigger.cpp

@@ -1,6 +1,4 @@
 /*
- * test-trigger.cpp - test trigger functions
- *
  * SPDX-FileCopyrightText: 2021-2025 Sébastien Helleu <flashcode@flashtux.org>
  *
  * SPDX-License-Identifier: GPL-3.0-or-later
@@ -21,6 +19,8 @@
  * along with WeeChat.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+/* Test trigger functions */
+
 #include "CppUTest/TestHarness.h"
 
 #include "tests/tests.h"