window_actor: Remove the frame_messages timeout in destroy

Otherwise it might fire off later and cause a crash.

https://bugzilla.gnome.org/show_bug.cgi?id=723468
monitorManager: Fix logic bug in make_logical_config

The code that prevents the creation of multiple MonitorInfos for clones
wasn't working due to using the wrong index when getting the already
created info so fix that to use the correct one.

https://bugzilla.gnome.org/show_bug.cgi?id=710610