Remove unused config

Signed-off-by: Fabio José <fabiojose@gmail.com>

lib/bindings/http/receiver_structured_0_2.js

@@ -39,10 +39,6 @@ function is_valid_http_request(req, res, config) {
 function HTTPStructured(configuration){
   this.config = configuration;
 
-  this.config["headers"] = {
-    "content-type":"application/cloudevents+json; charset=utf-8"
-  };
-
   if(!this.config["path"]){
     this.config["path"] = "/";
   }