Fix incorrect lambda capture leading to crash.

Fixes #1451

src/mainwindow.cpp

@@ -2336,8 +2336,8 @@ void MainWindow::connectDocument()
     connect(pCore->mixer(), &MixerManager::purgeCache, m_projectMonitor, &Monitor::purgeCache);
     getMainTimeline()->controller()->clipActions = kdenliveCategoryMap.value(QStringLiteral("timelineselection"))->actions();
 
-    connect(m_projectMonitor, &Monitor::zoneUpdated, project, [&](const QPoint &) { project->setModified(); });
-    connect(m_clipMonitor, &Monitor::zoneUpdated, project, [&](const QPoint &) { project->setModified(); });
+    connect(m_projectMonitor, &Monitor::zoneUpdated, project, [project](const QPoint &) { project->setModified(); });
+    connect(m_clipMonitor, &Monitor::zoneUpdated, project, [project](const QPoint &) { project->setModified(); });
     connect(project, &KdenliveDoc::docModified, this, &MainWindow::slotUpdateDocumentState);
 
     if (m_renderWidget) {