test: shorten test-benchmark-http

Add `--set key=""` to cut down the time it takes to run
test-benchmark-http by about a third.

Alphabetize options in `--set` list.

PR-URL: #13109
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

Author: Trott

test/sequential/test-benchmark-http.js

@@ -20,12 +20,13 @@ const path = require('path');
 
 const runjs = path.join(__dirname, '..', '..', 'benchmark', 'run.js');
 
-const child = fork(runjs, ['--set', 'dur=0.1',
-                           '--set', 'n=1',
-                           '--set', 'len=1',
+const child = fork(runjs, ['--set', 'benchmarker=test-double',
                            '--set', 'c=1',
                            '--set', 'chunks=0',
-                           '--set', 'benchmarker=test-double',
+                           '--set', 'dur=0.1',
+                           '--set', 'key=""',
+                           '--set', 'len=1',
+                           '--set', 'n=1',
                            'http'],
                    {env: {NODEJS_BENCHMARK_ZERO_ALLOWED: 1}});
 child.on('exit', (code, signal) => {