StudioWelcome: Do not deactivate welcomepage

This leads to crashes and is not necessary.

Change-Id: If7450aeb5c9fc8192ba79d0e1b28c76a0edbccac
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/studiowelcome/studiowelcomeplugin.cpp

@@ -660,10 +660,12 @@ WelcomeMode::WelcomeMode()
 
     m_dataModelDownloader->start();
 
+/*
     connect(Core::ModeManager::instance(), &Core::ModeManager::currentModeChanged, this, [this](Utils::Id mode){
        bool active = (mode == Core::Constants::MODE_WELCOME);
        m_modeWidget->rootObject()->setProperty("active", active);
     });
+*/
 
     if (!useNewWelcomePage()) {