Don't pass req in open handler

examples/BroadcastingEchoServer.cpp

@@ -16,7 +16,7 @@ int main() {
         .idleTimeout = 10,
         .maxBackpressure = 1 * 1024 * 1204,
         /* Handlers */
-        .open = [](auto *ws, auto *req) {
+        .open = [](auto *ws) {
             /* Let's make every connection subscribe to the "broadcast" topic */
             ws->subscribe("broadcast");
         },

examples/EchoServer.cpp

@@ -84,7 +84,7 @@ int main() {
 
 
         },
-        .open = [](auto *ws, auto *req) {
+        .open = [](auto *ws) {
             /* Open event here, you may access ws->getUserData() which points to a PerSocketData struct */
             std::cout << "Something is: " << static_cast<PerSocketData *>(ws->getUserData())->something << std::endl;
         },

examples/EchoServerThreaded.cpp

@@ -22,7 +22,7 @@ int main() {
                 .idleTimeout = 10,
                 .maxBackpressure = 1 * 1024 * 1204,
                 /* Handlers */
-                .open = [](auto *ws, auto *req) {
+                .open = [](auto *ws) {
 
                 },
                 .message = [](auto *ws, std::string_view message, uWS::OpCode opCode) {