Revamp Shared Memory Example: Fix include order

Fix include order to respect the Coding Conventions.

Task-number: QTBUG-108858
Pick-to: 6.6 6.5
Change-Id: Ifecf7c60ca7135104631587b25e907cb1d39e25b
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>

examples/corelib/ipc/sharedmemory/dialog.cpp

@@ -2,8 +2,9 @@
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
 #include "dialog.h"
-#include <QFileDialog>
+
 #include <QBuffer>
+#include <QFileDialog>
 
 /*!
   \class Dialog

examples/corelib/ipc/sharedmemory/dialog.h

@@ -6,6 +6,7 @@
 
 #include <QDialog>
 #include <QSharedMemory>
+
 #include "ui_dialog.h"
 
 //! [0]

examples/corelib/ipc/sharedmemory/main.cpp

@@ -1,9 +1,10 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
-#include <QApplication>
 #include "dialog.h"
 
+#include <QApplication>
+
 //! [0]
 int main(int argc, char *argv[])
 {