Correct license for test files

According to QUIP-18 [1], all test files should be
LicenseRef-Qt-Commercial OR GPL-3.0-only

[1]: https://contribute.qt-project.org/quips/18

Pick-to: 6.7
Task-number: QTBUG-121787
Change-Id: I9cf2eefe287996e7cc75fbde3832d4692797522e
Reviewed-by: Kai Köhne <kai.koehne@qt.io>

tests/auto/dds/tst_qdds.cpp

@@ -1,6 +1,6 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // Copyright (C) 2016 Ivan Komissarov.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
 #include <QtTest/QtTest>
 #include <QtGui/QtGui>

tests/auto/heif/tst_qheif.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2017 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
 #include <QtTest/QtTest>
 #include <QtGui/QtGui>

tests/auto/icns/tst_qicns.cpp

@@ -1,6 +1,6 @@
 // Copyright (C) 2022 The Qt Company Ltd.
 // Copyright (C) 2016 Alex Char.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
 #include <QtTest/QtTest>
 #include <QtGui/QtGui>

tests/auto/jp2/tst_qjp2.cpp

@@ -1,6 +1,6 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // Copyright (C) 2016 Petroules Corporation.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
 #include <QtTest/QtTest>
 #include <QtGui/QtGui>

tests/auto/mng/tst_qmng.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
 #include <QtTest/QtTest>
 #include <QtGui/QtGui>

tests/auto/tga/tst_qtga.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
 #include <QtTest/QtTest>
 #include <QtGui/QtGui>

tests/auto/tiff/tst_qtiff.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
 #include <QtTest/QtTest>
 #include <QtGui/QtGui>

tests/auto/wbmp/tst_qwbmp.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
 #include <QtTest/QtTest>
 #include <QtGui/QtGui>

tests/auto/webp/tst_qwebp.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
 #include <QtTest/QtTest>
 #include <QtGui/QtGui>

tests/benchmarks/mng/tst_qmng.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
 #include <QtTest/QtTest>
 #include <QtGui/QtGui>

tests/benchmarks/tiff/tst_qtiff.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
 #include <QtTest/QtTest>
 #include <QtGui/QtGui>