ForegroundProcessDialog: Modernise/Gtk4 preparation

src/Dialogs/ForegroundProcessDialog.vala

@@ -1,21 +1,7 @@
-// -*- Mode: vala; indent-tabs-mode: nil; tab-width: 4 -*-
 /*
-* Copyright (c) 2011-2017 elementary LLC. (https://elementary.io)
-*
-* This program is free software; you can redistribute it and/or
-* modify it under the terms of the GNU Lesser General Public
-* License version 3 as published by the Free Software Foundation.
-*
-* 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 Lesser General Public
-* License along with this program; if not, write to the
-* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-* Boston, MA 02110-1301 USA
-*/
+ * SPDX-License-Identifier: LGPL-3.0-or-later
+ * SPDX-FileCopyrightText: 2011-2017 elementary, Inc. (https://elementary.io)
+ */
 
 public class Terminal.ForegroundProcessDialog : Granite.MessageDialog {
     public string button_label { get; construct; }