message: gui: Fix m_node.startShutdown() order
  This change forwards the shutdown request on the GUI (close the
  application for instace) to the node as soon as possible. This way the
  GUI doesn't have to wait for long operations to complete (rescan the
  wallet for instance), instead those operations detect the shutdown
  request and abort/interrupt.
diff: @@ -309,14 +309,20 @@ void BitcoinApplication::requestShutdown()
  qDebug() << __func__ << ": Requesting shutdown";
  startThread();
  window->hide();
  + // Must disconnect node signals otherwise current thread can deadlock since
  + // no event loop is running.
  + window->unsubscribeFromCoreSignals();
  + // Request node shutdown, which can interrupt long operations, like
  + // rescanning a wallet.
  + m_node.startShutdown();
  + // Unsetting the client model can cause the current thread to wait for node
  + // to complete an operation, like wait for a RPC execution to complate.
  window->setClientModel(nullptr);
  pollShutdownTimer->stop();
  delete clientModel;
  clientModel = nullptr;
  - m_node.startShutdown();
  -
  // Request shutdown from core thread
  Q_EMIT requestedShutdown();
  }
  