pythonPackages.pyfiglet : move to separate expression

pkgs/development/python-modules/pyfiglet/default.nix

···
+{ stdenv, buildPythonPackage, fetchPypi }:
+
+buildPythonPackage rec {
+  version = "0.7.5";
+  pname = "pyfiglet";
+  name = "${pname}-${version}";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "04jy4182hn5xfs6jf432gxclfj1rhssd7bsf0b4gymrjzkhr8qa4";
+  };
+
+  doCheck = false;
+
+  meta = with stdenv.lib; {
+    description = "FIGlet in pure Python";
+    license     = licenses.gpl2Plus;
+    maintainers = with maintainers; [ thoughtpolice ];
+  };
+}

pkgs/top-level/python-packages.nix

···
 
   pyfftw = callPackage ../development/python-modules/pyfftw { };
 
-    meta = {
-      description = "FIGlet in pure Python";
-      license     = licenses.gpl2Plus;
-      maintainers = with maintainers; [ thoughtpolice ];
-    };
-  };
+  pyfiglet = callPackage ../development/python-modules/pyfiglet { };
 
   pyflakes = callPackage ../development/python-modules/pyflakes { };