ui/gtk: Update gd_refresh_rate_millihz() to handle VirtualConsole

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Jan Kiszka <jan.kiszka@web.de>
Message-id: 20200208161048.11311-2-f4bug@amsat.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
1 file changed