Revamp Shared Memory Example: Fix formatting of the dialog.h header

"dialog.h" has inconsitent indentation.

Task-number: QTBUG-108858
Change-Id: Id029d5ec63f3831e5ffcfe2b61d7e86896d4afb5
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
(cherry picked from commit 0a62d4e4c07ddcc650c67faf977663f7fb8aef62)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 1f4460cb1f0f3c40eb7f82c1222a3eb57bcdbc6b)

examples/corelib/ipc/sharedmemory/dialog.h

@@ -14,21 +14,21 @@ class Dialog : public QDialog
 {
     Q_OBJECT
 
-  public:
+public:
     Dialog(QWidget *parent = nullptr);
 
-  public slots:
+public slots:
     void loadFromFile();
     void loadFromMemory();
 
- private:
+private:
     void detach();
 
-  private:
+private:
     Ui::Dialog ui;
     QSharedMemory sharedMemory;
 };
 //! [0]
 
-#endif
+#endif // DIALOG_H