clex: move to applications/file-managers

pkgs/top-level/all-packages.nix

···
     inherit (darwin.apple_sdk.frameworks) Foundation;
   };
 
-  clex = callPackage ../tools/misc/clex { };
+  clex = callPackage ../applications/file-managers/clex { };
 
   client-ip-echo = callPackage ../servers/misc/client-ip-echo { };