Object: Rework how Object.normalize works

Now it defaults to not fetching, and the option is named.

lib/pleroma/web/rich_media/helpers.ex

@@ -69,7 +69,7 @@ defmodule Pleroma.Web.RichMedia.Helpers do
 
   def fetch_data_for_activity(%Activity{data: %{"type" => "Create"}} = activity) do
     with true <- Config.get([:rich_media, :enabled]),
-         %Object{} = object <- Object.normalize(activity) do
+         %Object{} = object <- Object.normalize(activity, fetch: false) do
       fetch_data_for_object(object)
     else
       _ -> %{}