during pyside6-essentials scan, scancode does not detect LGPL/GPL licenses in files

### Description

> Please leave a brief description of the bug or feature request:

During pyside6-essentials scan, scancode does not detect LGPL/GPL licenses in files:
Question: Are the LGPL/GPL used in this package not standardized or why are these licenses not detected?

### How To Reproduce

> Tell us how to reproduce the issue.
```
rem get PySide6-Essentials from https://files.pythonhosted.org/packages/55/e0/ccbf260a6545460d1da255810320d4f0cc8aee7fe4127eec07cfa6297228/PySide6_Essentials-6.3.0-cp36-abi3-win_amd64.whl

set "suffix=PySide6_essentials"
set "folder=PySide6"
set "file_name=%suffix%"

call scancode.exe ^
-lcp ^
-n 5 ^
--csv %file_name%.csv ^
--html %file_name%.html ^
--json %file_name%.json ^
--license-text ^
--unknown-licenses ^
--only-findings ^
--consolidate ^
--filter-clues ^
--is-license-text ^
--info ^
--license-text ^
--license-text-diagnostics ^
--license-clarity-score ^
--summary ^
--classify ^
--full-root ^
%folder%
```

### System configuration

> For bug reports, it really helps us to know:

* What OS are you running on? (Windows/MacOS/Linux): `Windows 10 19042`
* What version of scancode-toolkit was used to generate the scan file?: `30.1.0`
* What installation method was used to install/run scancode? (pip/source download/other):

**Example**:
From file `d:\PySide6_Essentials-6.3.0-cp36-abi3-win_amd64\PySide6\qml\QtQuick\Controls\Universal\MenuSeparator.qml `
```
/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Quick Controls 2 module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

```

Result (a kind of LGPLv3 and GPLv3 or later license were also expected):