fixes webpack#1616, allows var retries to increase at each reconnect

Author: Carlos Requena López

client-src/default/socket.js

@@ -8,9 +8,7 @@ let sock = null;
 const socket = function initSocket(url, handlers) {
   sock = new SockJS(url);
 
-  sock.onopen = function onopen() {
-    retries = 0;
-  };
+  sock.onopen = function onopen() {};
 
   sock.onclose = function onclose() {
     if (retries === 0) { handlers.close(); }