[gui] fix compile with rc (c++20)

Author: dlyr

Sandbox/Gui/MainWindow.cpp

@@ -236,7 +236,7 @@ void MainWindow::createConnections() {
     connect( m_showHideAllButton, &QPushButton::clicked, this, &MainWindow::showHideAllRO );
 
     // Renderer stuff
-    connect( m_currentRendererCombo, &QComboBox::currentTextChanged, [=]( const QString& ) {
+    connect( m_currentRendererCombo, &QComboBox::currentTextChanged, [this]( const QString& ) {
         this->onCurrentRenderChangedInUI();
     } );