mateamt: update + reduce

mateamt.nix

@@ -1,15 +1,5 @@
-{ pkgs ? import <nixpkgs> (import <haskell-nix>)
+{ pkgs ? import <nixpkgs> {}
 }:
 {
-  mateamt = pkgs.lib.hydraJob (import <mateamt> {
-    inherit pkgs;
-  } // {
-    meta = with pkgs.stdenv.lib; {
-      description = "A whole new matemat";
-      maintainers = [
-        { email = "nek0@nek0.eu"; name = "nek0"; }
-      ];
-      license = licenses.agpl3;
-    };
-  });
+  mateamt = pkgs.lib.hydraJob (pkgs.haskellPackages.callPackage <mateamt> {});
 }