No more `show-unicode-menu` key

[cassidyjames]

On OS 7:

No such key “show-unicode-menu” in schema “org.gnome.desktop.interface:Pantheon” as specified in override file “/usr/share/glib-2.0/schemas/default-settings.gschema.override”; ignoring override for this key.

[milouse]

This key has been moved as being just an xsettings override thing