lib: fix off-by-one indentation

In preparation for more robust indentation linting, fix an off-by-one
indentation in lib/http_server.js.

PR-URL: #14064
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: Trott

lib/_http_server.js

@@ -187,7 +187,7 @@ function writeHead(statusCode, reason, obj) {
   statusCode |= 0;
   if (statusCode < 100 || statusCode > 999) {
     throw new errors.RangeError('ERR_HTTP_INVALID_STATUS_CODE',
-                                 originalStatusCode);
+                                originalStatusCode);
   }