Fix links to VS Code binaries

Fixes apache/daffodil-vscode#365
diff --git a/site/_layouts/vscode.html b/site/_layouts/vscode.html
index 1426fad..dd99996 100644
--- a/site/_layouts/vscode.html
+++ b/site/_layouts/vscode.html
@@ -49,7 +49,7 @@
           <p>
           {% include download-list.html
              apache=page.apache
-             artifacts=page.source-dist
+             artifacts=page.binary-dist
              project="daffodil/daffodil-vscode"
              type="bin"
              version=page.title