nixos: services: paperless: remove MKL work-around

Instead, rely on the upstream service's work-around [1].

This will reduce the amount of package builds I need to do when updating
my server...

[1]: https://github.com/NixOS/nixpkgs/pull/299008

This reverts commit e2ec4d3032.

modules/nixos/services/paperless/default.nix

@@ -1,4 +1,4 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, ... }:
 let
   cfg = config.my.services.paperless;
 in
@@ -80,9 +80,6 @@ in
           # Misc
           PAPERLESS_TIME_ZONE = config.time.timeZone;
           PAPERLESS_ADMIN_USER = cfg.username;
-
-          # Fix classifier hangs
-          LD_LIBRARY_PATH = "${lib.getLib pkgs.mkl}/lib";
         };
 
       # Admin password