Use inserted_at as sort in search.

lib/pleroma/web/twitter_api/twitter_api.ex

@@ -213,7 +213,7 @@ defmodule Pleroma.Web.TwitterAPI.TwitterAPI do
       where: fragment("to_tsvector('english', ?->'object'->>'content') @@ plainto_tsquery('english', ?)", a.data, ^query),
       limit: ^limit,
       offset: ^offset,
-      order_by: [desc: :updated_at] # this one isn't indexed so psql won't take the wrong index.
+      order_by: [desc: :inserted_at] # this one isn't indexed so psql won't take the wrong index.
 
     activities = Repo.all(q)
     activities_to_statuses(activities, %{for: user})