http: do not assign intermediate variable

No need for binding, it's only used in the next line to declare more
variables :)

PR-URL: #17335
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>

lib/_http_common.js

@@ -21,8 +21,7 @@
 
 'use strict';
 
-const binding = process.binding('http_parser');
-const { methods, HTTPParser } = binding;
+const { methods, HTTPParser } = process.binding('http_parser');
 
 const FreeList = require('internal/freelist');
 const { ondrain } = require('internal/http');