workspace: Add missing chain-up for finalize()

https://bugzilla.gnome.org/show_bug.cgi?id=708070
window: Fix memory leak

https://bugzilla.gnome.org/show_bug.cgi?id=708070
shaped-texture: Fix memory leak

https://bugzilla.gnome.org/show_bug.cgi?id=708070
MonitorConfig: fix memory leak

https://bugzilla.gnome.org/show_bug.cgi?id=708070