applications: Set the Icon key in desktop file to a icon that exists
While we dynamically append --symbolic to the icons while creating the sidebar model in https://gitlab.gnome.org/GNOME/gnome-control-center/-/blob/master/shell/cc-shell-model.c#L270 There are automation tools (such as rpmdiff) that parse desktop files and verify whether their Icon= matches to an existing file in the icon theme package.
preferences-desktop-apps doesn't exist in adwaita-icon-theme but preferences-desktop-apps-symbolic does.
Ideally this should go in gnome-41 too.