nixos/tests/calibre-web.nix: get rid of `with lib`

nixos/tests/calibre-web.nix

···
       port = 3142;
       defaultPort = 8083;
     in
-      with lib;
       {
         name = "calibre-web";
-        meta.maintainers = with pkgs.lib.maintainers; [ pborzenkov ];
+        meta.maintainers = with lib.maintainers; [ pborzenkov ];
 
         nodes = {
           customized = { pkgs, ... }: {