[Summary] Allow to apply changes on Enter button pressed from "numeric" keyboard

[Reviewed] GZharun

gtk2_ardour/tracks_control_panel.logic.cc

@@ -1709,6 +1709,7 @@ TracksControlPanel::on_key_press_event (GdkEventKey* ev)
     switch (ev->keyval)
     {
         case GDK_Return:
+        case GDK_KP_Enter:
             accept ();
             hide ();
             return true;