http: fix mediaproxy

lib/pleroma/http/http.ex

@@ -19,7 +19,7 @@ defmodule Pleroma.HTTP do
     end
   end
 
-  defp process_request_options(options) do
+  def process_request_options(options) do
     config = Application.get_env(:pleroma, :http, [])
     proxy = Keyword.get(config, :proxy_url, nil)
     options = options ++ [hackney: [pool: :default]]