Revert "Fix mkTf2Config derivation names ending with a dash -"

This reverts commit 61c63737af.

Fixes JumpAcademy maps failing to build.

tf2/mkTf2Config.nix

@@ -1,7 +1,7 @@
 { stdenv, lib }:
 
 { pname
-, version ? null
+, version ? ""
 , custom ? []
 , cfg ? []
 , maps ? []
@@ -47,7 +47,6 @@ let
     "env"
   ];
 in stdenv.mkDerivation ({
-  inherit name;
   inherit pname version;
   # Adapted from stdenv's _defaultUnpack().
   unpackCmd = ''