benchmark: fix http bench-parser.js

The internal HTTParser `reinitialize()` function was removed in
ece50739 and replaced with an `initialize()` function. This broke
benchmark/http/bench-parser.js. This change updates the benchmark so
that it runs again.

PR-URL: https://github.com/nodejs/node/pull/27359


Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>