avell-unofficial-control-center: move to by-name

pkgs/top-level/all-packages.nix

···
 
   autotiling = python3Packages.callPackage ../misc/autotiling { };
 
-  avell-unofficial-control-center =
-    callPackage ../applications/misc/avell-unofficial-control-center
-      { };
-
   brgenml1lpr = pkgsi686Linux.callPackage ../misc/cups/drivers/brgenml1lpr { };
 
   foomatic-db-ppds-withNonfreeDb = callPackage ../by-name/fo/foomatic-db-ppds/package.nix {