Fix mkTf2Config derivation names ending with a dash -

Also changed some of the source derivation names to keep our sanity

tf2/mkTf2Config.nix

@@ -1,7 +1,7 @@
 { stdenv, lib }:
 
 { pname
-, version ? ""
+, version ? null
 , custom ? []
 , cfg ? []
 , maps ? []
@@ -35,6 +35,7 @@ let
     then { src = builtins.head allSrcs; }
     else { srcs = allSrcs; sourceRoot = "."; };
 in stdenv.mkDerivation ({
+  inherit name;
   inherit pname version;
   # Adapted from stdenv's _defaultUnpack().
   unpackCmd = ''