Revert "apparmor: fix and improve the service"

This reverts commit fb6d63f3fd.

I really hope this finally fixes #99236: evaluation on Hydra.
This time I really did check basically the same commit on Hydra:
https://hydra.nixos.org/eval/1618011

Right now I don't have energy to find what exactly is wrong in the
commit, and it doesn't seem important in comparison to nixos-unstable
channel being stuck on a commit over one week old.

nixos/modules/config/malloc.nix

@@ -87,12 +87,5 @@ in
     environment.etc."ld-nix.so.preload".text = ''
       ${providerLibPath}
     '';
-    security.apparmor.includes = {
-      "abstractions/base" = ''
-        r /etc/ld-nix.so.preload,
-        r ${config.environment.etc."ld-nix.so.preload".source},
-        mr ${providerLibPath},
-      '';
-    };
   };
 }