cozy: rename directory and drop unused argument

Suggestions by @mweinelt and @r-rmcgibbo.

pkgs/applications/audio/cozy-audiobooks/default.nix pkgs/applications/audio/cozy/default.nix

···
 , libhandy
 , libdazzle
 , python3Packages
-, file
 , cairo
 , gettext
 , gnome

pkgs/top-level/all-packages.nix

···
     inherit (darwin.apple_sdk.frameworks) PCSC;
   };
 
-  cozy = callPackage ../applications/audio/cozy-audiobooks { };
+  cozy = callPackage ../applications/audio/cozy { };
 
   cpuid = callPackage ../os-specific/linux/cpuid { };