Client Side Decorations always reset to default when Xfwm is not installed

When you delete Xfwm, CSD layout always resets to default settings.

Steps to reproduce :

1. Uninstall Xfwm
2. Switch window manager
3. set gtk-decoration-layout in xfsettingsd channel e.g. '/Gtk/DecorationLayout' (for exapmle close:maximize)
4. Log out
5. Log in
6. See CSD layout back to default