Fix compile error

src/mainwindow.cpp

@@ -2046,7 +2046,7 @@ void MainWindow::setupDebugLogTab() {
     ui->debugLog->setPlainText( readDebugLines() );
 
     // Set up timer
-    QTimer* debugTimer = new QTimer(main);
+    QTimer* debugTimer = new QTimer();
     QObject::connect(debugTimer, &QTimer::timeout, [=]() {
         uint32_t debugLines = ui->debugLines->text().trimmed().toInt();
         if (debugLines == 0) { debugLines = 50; }