Revert "Make websocket permessage-deflate default to disabled since it causes problems with Chrome"

This reverts commit 622ff58039.

include/fc/network/http/websocket.hpp

@@ -59,7 +59,7 @@ namespace fc { namespace http {
       public:
          websocket_tls_server(const std::string& server_pem = std::string(),
                               const std::string& ssl_password = std::string(),
-                              bool enable_permessage_deflate = false);
+                              bool enable_permessage_deflate = true);
          ~websocket_tls_server();
 
          void on_connection( const on_connection_handler& handler);