savegame ex.: fix include order

Includes should be ordered from most specific to most general. This
means that project-specific includes always come before Qt includes.

This example didn't follow that guideline. Fix.

Task-number: QTBUG-108857
Change-Id: I42727ff8bdef5336368cde349cbcb8d10bb6289f
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
(cherry picked from commit 88e8094f18e6581f2b652eb3d82f514ecf687046)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

examples/corelib/serialization/savegame/level.h

@@ -4,11 +4,11 @@
 #ifndef LEVEL_H
 #define LEVEL_H
 
+#include "character.h"
+
 #include <QJsonObject>
 #include <QList>
 
-#include "character.h"
-
 //! [0]
 class Level
 {

examples/corelib/serialization/savegame/main.cpp

@@ -1,10 +1,11 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
+#include "game.h"
+
 #include <QCoreApplication>
 #include <QTextStream>
 
-#include "game.h"
 //! [0]
 int main(int argc, char *argv[])
 {