flywheel-cli: clean up after x86_64-darwin drop

pkgs/by-name/fl/flywheel-cli/package.nix

@@ -5,29 +5,13 @@
   unzip,
 }:
 
-let
-  inherit (stdenv.hostPlatform) system;
-  throwSystem = throw "Unsupported system: ${system}";
-
-  os =
-    {
-      x86_64-linux = "linux";
-    }
-    .${system} or throwSystem;
-
-  sha256 =
-    {
-      x86_64-linux = "sha256-SxBjRd95hoh2zwX6IDnkZnTWVduQafPHvnWw8qTuM78=";
-    }
-    .${system} or throwSystem;
-in
 stdenv.mkDerivation (finalAttrs: {
   pname = "flywheel-cli";
   version = "16.2.0";
 
   src = fetchurl {
-    url = "https://storage.googleapis.com/flywheel-dist/cli/${finalAttrs.version}/fw-${os}_amd64-${finalAttrs.version}.zip";
-    inherit sha256;
+    url = "https://storage.googleapis.com/flywheel-dist/cli/${finalAttrs.version}/fw-linux_amd64-${finalAttrs.version}.zip";
+    hash = "sha256-SxBjRd95hoh2zwX6IDnkZnTWVduQafPHvnWw8qTuM78=";
   };
 
   nativeBuildInputs = [ unzip ];
@@ -38,7 +22,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   installPhase = ''
     runHook preInstall
-    install -Dt $out/bin ./${os}_amd64/fw
+    install -Dt $out/bin ./linux_amd64/fw
     runHook postInstall
   '';