Bilal Elmoussaoui c861101ae6 backend: Check if the gsettings scheme exists
Mutter makes use of a gsettings scheme that comes from
gnome-settings-daemon to check for the screen orientation.
In use cases where gnome-settings-daemon is not available,
this would lead to a crash as the key doesn't exists

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2398>
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