Insert red line on waterfall to mark an FT4 transmission.

widgets/mainwindow.cpp

@@ -4036,7 +4036,8 @@ void MainWindow::stopTx2()
     on_stopTxButton_clicked ();
     m_nTx73 = 0;
   }
-  if(m_mode.startsWith ("WSPR") and m_ntr==-1 and !m_tuneup) {
+  if(((m_mode.startsWith("WSPR") and m_ntr==-1) or m_mode=="FT4") and
+     !m_tuneup) {
     m_wideGraph->setWSPRtransmitted();
     WSPR_scheduling ();
     m_ntr=0;