Avoid double call.

alethzero/MainWin.cpp

@@ -26,6 +26,7 @@
 #include <boost/asio.hpp>
 
 #pragma GCC diagnostic ignored "-Wpedantic"
+//pragma GCC diagnostic ignored "-Werror=pedantic"
 #include <QtNetwork/QNetworkReply>
 #include <QtWidgets/QFileDialog>
 #include <QtWidgets/QMessageBox>
@@ -120,7 +121,6 @@ Main::Main(QWidget *parent) :
 	QtWebEngine::initialize();
 	setWindowFlags(Qt::Window);
 	ui->setupUi(this);
-	QtWebEngine::initialize();
 	g_logPost = [=](string const& s, char const* c)
 	{
 		simpleDebugOut(s, c);