Relicense LGPL-2.0-only files to LGPL-2.0-or-later

All contributors are recorded in relicensecheck.pl

tests/testldapclient.cpp

 /* This file is part of the KDE project
    SPDX-FileCopyrightText: 2005 David Faure <faure@kde.org>
 
-   SPDX-License-Identifier: LGPL-2.0-only
+   SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "testldapclient.h"

tests/testldapclient.h

 /* This file is part of the KDE project
    SPDX-FileCopyrightText: 2005 David Faure <faure@kde.org>
 
-   SPDX-License-Identifier: LGPL-2.0-only
+   SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #ifndef TESTLDAPCLIENT_H