windows tests: run for only conda-artiq

Reverts b660ad6, addresses b660ad6723 (commitcomment-33133559)

artiq/windows/default.nix

@@ -2,7 +2,7 @@
   diskImage ? "/opt/windows/c.img",
   qemuMem ? "2G",
   testTimeout ? 120,
-  artiq ? import ./.. { inherit pkgs; },
+  artiqPkg ? import ../conda-artiq.nix { inherit pkgs; },
 }:
 
 with pkgs;
@@ -43,9 +43,9 @@ let
     ${ssh "miniconda\\Scripts\\conda install -y -n ${condaEnv} $F"}
     ${ssh "del $F"}
   '';
-  makeTest = name: artiqPkg:
+in
   stdenv.mkDerivation {
-      name = "windows-test-${name}";
+    name = "windows-test-conda-artiq";
     src = ./.;
     dontBuild = true;
     installPhase = ''
@@ -80,13 +80,4 @@ let
       # Power off immediately
       ${ssh "shutdown -p -f"}
     '';
-    };
-  condaPackageNames =
-    builtins.filter (name: builtins.match "conda-.+" name != null)
-    (builtins.attrNames artiq);
-in
-  builtins.listToAttrs
-  (map (pkgName: {
-    name = pkgName;
-    value = makeTest pkgName artiq.${pkgName};
-  }) condaPackageNames)
+  }