Actually set headers in sinatra routes

The headers weren't actually set previously.
The statement `headers = res_headers` doesn't have any effect, since it
only creates a local variable.

Signed-off-by: Alexis Reigel <mail@koffeinfrei.org>

template/ruby-http/index.rb

@@ -13,27 +13,23 @@
 get '/*' do
   res, res_headers = handler.run request.body, request.env
 
-  headers = res_headers
-
-  return res
+  [200, res_headers, res]
 end
 
 post '/*' do
-    res, res_headers = handler.run request.body, request.env
-    headers = res_headers
-    return res
+  res, res_headers = handler.run request.body, request.env
+
+  [200, res_headers, res]
 end
 
 put '/*' do
-    res, res_headers = handler.run request.body, request.env
-    headers = res_headers
+  res, res_headers = handler.run request.body, request.env
 
-    return res
+  [200, res_headers, res]
 end
 
 delete '/*' do
-    res, res_headers = handler.run request.body, request.env
-    headers = res_headers
+  res, res_headers = handler.run request.body, request.env
 
-    return res
+  [200, res_headers, res]
 end