http: revise _http_server.js

* replace var with const
* eliminate unnecessary bytesParsed variable

http: remove bytesParsed var

PR-URL: https://github.com/nodejs/node/pull/30279


Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Yorkie Liu <yorkiefixer@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>