Fix segfault on close

m_wizard has a parent now.

src/mainwindow.cpp

@@ -935,8 +935,6 @@ void MainWindow::closeEvent(QCloseEvent *event) {
     m_ctx->tor->stop();
 
     this->saveGeo();
-    if(m_wizard != nullptr)
-        m_wizard->close();
 
     QWidget::closeEvent(event);
 }