Fix Qt4 build

Change-Id: Ib3cf2d36955ede2d119b67f1f664e456f2724d55
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/resourceeditor/resourceeditorplugin.cpp

@@ -79,6 +79,7 @@ public:
 
         QDialogButtonBox *buttons = new QDialogButtonBox(QDialogButtonBox::Ok
                                                          | QDialogButtonBox::Cancel,
+                                                         Qt::Horizontal,
                                                          this);
 
         layout->addWidget(buttons);