Respect --no-open option during server startup

Summary:
This was previously ignored and can get a little annoying while testing.

Changelog: Respect --no-open during server startup

Reviewed By: timur-valiev

Differential Revision: D34932895

fbshipit-source-id: d2bf9d6fb57a76834b86ab013baf01628d2550fc

desktop/scripts/start-flipper-server-dev.tsx

@@ -130,7 +130,7 @@ let startCount = 0;
 async function restartServer() {
   try {
     await compileServerMain(true);
-    await launchServer(true, ++startCount === 1); // only openon the first time
+    await launchServer(true, argv.open && ++startCount === 1); // only open on the first time
   } catch (e) {
     console.error(
       chalk.red(