test: remove unused callback argument

PR-URL: #30712
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

test/sequential/test-http-max-http-headers.js

@@ -94,7 +94,7 @@ function test1() {
   headers = fillHeaders(headers, currentSize);
 
   const server = net.createServer((sock) => {
-    sock.once('data', (chunk) => {
+    sock.once('data', () => {
       writeHeaders(sock, headers);
       sock.resume();
     });