TCP is the only option so remove unused branches

Summary: As TCP is the only option, remove all branches.

Reviewed By: passy

Differential Revision: D48265093

fbshipit-source-id: 174527f05d8a841797fd95256e77fdeb9b2e6ad5

desktop/flipper-server/src/index.tsx

@@ -208,7 +208,6 @@ async function start() {
     staticPath,
     entry: `index.web${argv.bundler ? '.dev' : ''}.html`,
     port: argv.port,
-    tcp: true,
   });
 
   const t4 = performance.now();