Example: fix memory leak in relationnaltablemodel example

The example creates a view on the heap but doesn't delete it on
application end. This patch uses a QScopedPointer to fix that.

Change-Id: I3b0c8589999d243c193bd02e1470c03eabfabe40
Reviewed-by: Sze Howe Koh <szehowe.koh@gmail.com>

examples/sql/relationaltablemodel/relationaltablemodel.cpp

@@ -117,7 +117,7 @@ int main(int argc, char *argv[])
 
     initializeModel(&model);
 
-    QTableView *view = createView(QObject::tr("Relational Table Model"), &model);
+    QScopedPointer<QTableView> view(createView(QObject::tr("Relational Table Model"), &model));
     view->show();
 
     return app.exec();