added missing include to avoid build failure

WizQTClient/src/wizmainwindow.cpp: In member function ‘void Core::Internal::MainWindow::on_syncDone(int, const QString&)’:
WizQTClient/src/wizmainwindow.cpp:927:94: error: cannot convert ‘QPushButton*’ to ‘QAbstractButton*’ in initialization
                     messageBox.addButton(tr("Don't show this again"), QMessageBox::ActionRole);
                                                                                              ^