Add missing include (fix some qt6 compile error)

[Laurent Montel]

Hi,
This patch will help to build against qt6.
We need to include <QStringList> vs using forward declaration

Could you apply it please ?
Thanks

-- 
Laurent Montel | laurent.montel at kdab.com | KDE/Qt Senior Software Engineer 
KDAB (France) S.A.S., a KDAB Group company
Tel: France +33 (0)4 90 84 08 53, http://www.kdab.fr
KDAB - The Qt, C++ and OpenGL Experts
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