benchmark: fix http/simple.js benchmark

autocannon appears to have trouble recognizing URLs that contain true
or false within them. Use 0 or 1 instead to represent the same.

PR-URL: #17583
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

benchmark/fixtures/simple-http-server.js

@@ -34,7 +34,7 @@ module.exports = http.createServer(function(req, res) {
   const arg = params[2];
   const n_chunks = parseInt(params[3], 10);
   const resHow = params.length >= 5 ? params[4] : 'normal';
-  const chunkedEnc = params.length >= 6 && params[5] === 'false' ? false : true;
+  const chunkedEnc = params.length >= 6 && params[5] === '0' ? false : true;
   var status = 200;
 
   var n, i;

benchmark/http/simple.js

@@ -8,14 +8,14 @@ const bench = common.createBenchmark(main, {
   len: [4, 1024, 102400],
   chunks: [1, 4],
   c: [50, 500],
-  chunkedEnc: ['true', 'false'],
+  chunkedEnc: [1, 0],
   res: ['normal', 'setHeader', 'setHeaderWH']
 });
 
 function main(conf) {
   process.env.PORT = PORT;
   var server = require('../fixtures/simple-http-server.js')
-  .listen(process.env.PORT || common.PORT)
+  .listen(PORT)
   .on('listening', function() {
     const path =
       `/${conf.type}/${conf.len}/${conf.chunks}/${conf.res}/${conf.chunkedEnc}`;