* Touchpad scroll-method was migrated before from u-s-d to gesetting-desktop-schemas. Now that gsettings-desktop-schemas removed that schema, port it back under unity-settings-daemon schemas

* Make build depends on gsettings-unity-schemas-dev >=0.0.7+21.10.20210712-0ubuntu1

* Use draw-background key from gsettings-ubuntu-schemas.

* Remove legacy desktop interface schema from xsettings translations entry. See https://salsa.debian.org/gnome-team/gsettings-desktop-schemas/-/commit/82d78fbcc800cac5cca11e9a146a1ea2d6388165

LP: #1933646 (LP: #1933646)

Approved by: Sebastien Bacher