Disconnect signal handler from vte before destroying the widget.

Patch sent to FreeBSD bugzilla by Hodong <hodong@nimfsoft.com>

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250403

Could be a fix for issue #2457

Author: madpilot78

src/vte.c

@@ -399,6 +399,7 @@ void vte_close(void)
 	g_free(vf);
 	/* free the vte widget before unloading vte module
 	 * this prevents a segfault on X close window if the message window is hidden */
+	g_signal_handlers_disconnect_by_func(vc->vte, G_CALLBACK(vte_start), NULL);
 	gtk_widget_destroy(vc->vte);
 	gtk_widget_destroy(vc->menu);
 	g_object_unref(vc->menu);