tests: Message: Clean up copyright lines and includes (#426)

Author: melvo

tests/qxmppmessage/tst_qxmppmessage.cpp

@@ -1,6 +1,5 @@
 // SPDX-FileCopyrightText: 2012 Jeremy Lainé <[email protected]>
 // SPDX-FileCopyrightText: 2012 Manjeet Dahiya <[email protected]>
-// SPDX-FileCopyrightText: 2012 Germán Márquez Mejía <[email protected]>
 // SPDX-FileCopyrightText: 2021 Melvin Keskin <[email protected]>
 //
 // SPDX-License-Identifier: LGPL-2.1-or-later
@@ -9,7 +8,6 @@
 #include "QXmppBitsOfBinaryDataList.h"
 #include "QXmppMessage.h"
 #include "QXmppMixInvitation.h"
-#include "QXmppOmemoElement_p.h"
 #include "QXmppTrustMessageElement.h"
 
 #include <optional>