Don't tear down server on disconnect

Summary: These safeguards were added based on a discussion in D35088208 (56e94394ca) but turned out to be counter-productive. Every time a client disconnects now, we're tearing down the socket and the server, allowing for no future connections.

Reviewed By: lblasa

Differential Revision: D36252605

fbshipit-source-id: c3b6f85dea4054505a47d24a72a4aac403371c0f

desktop/flipper-server/src/startBaseServer.tsx

@@ -161,15 +161,6 @@ async function startProxyServer(
     res.end('Failed to proxy request: ' + err);
   });
 
-  proxyServer.on('close', () => {
-    server.close();
-  });
-
-  server.on('close', () => {
-    proxyServer.close();
-    fs.remove(socketPath);
-  });
-
   return new Promise((resolve) => {
     proxyServer.listen(config.port);
     server.listen(socketPath, undefined, () => resolve({app, server}));