[Qt][OSX] Fix Cmd-Q / Menu Quit shutdown on OSX

src/qt/bitcoin.cpp

@@ -370,6 +370,7 @@ void BitcoinApplication::createSplashScreen(const NetworkStyle *networkStyle)
     splash->setAttribute(Qt::WA_DeleteOnClose);
     splash->show();
     connect(this, SIGNAL(splashFinished(QWidget*)), splash, SLOT(slotFinish(QWidget*)));
+    connect(this, SIGNAL(requestedShutdown()), splash, SLOT(close()));
 }
 
 void BitcoinApplication::startThread()