python.pkgs.metaphone: fix pname

This is a proper fix for 2224d42e02.
The pname is used by fetchPypi, so you can't just modify it
and expect fetching to still work.

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

@@ -5,7 +5,8 @@ buildPythonPackage rec {
   version = "0.6";
 
   src = fetchPypi {
-    inherit pname version;
+    pname = "Metaphone";
+    inherit version;
     sha256 = "09ysaczwh2rlsqq9j5fz7m4pq2fs0axp5vvivrpfrdvclvffl2xd";
   };