Set the right environment info for headless builds

Summary: The isHeadlessBuild flag was not properly set.

Reviewed By: antonk52

Differential Revision: D45728435

fbshipit-source-id: 3616c4358114d4f3d96372766dabf48b27b44333

desktop/app/src/init.tsx

@@ -182,6 +182,7 @@ async function getFlipperServer(
         false,
         keytar,
         'embedded',
+        environmentInfo.isHeadlessBuild,
       );
 
       const companionEnv = await initCompanionEnv(server);