Make project REUSE-compliant

tests/gtk_themes/Qogir.js

@@ -1,20 +1,5 @@
-/*
-Night Theme Switcher Gnome Shell extension
-
-Copyright (C) 2020 Romain Vigier
-
-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 <http s ://www.gnu.org/licenses/>.
-*/
+// SPDX-FileCopyrightText: 2020, 2021 Romain Vigier <contact AT romainvigier.fr>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 const test = require('ava');
 const { Variants } = require('./_variants');