twitter/mastodon api: always use mediaproxy URLs in attachments

if using local media, the mediaproxy will not replace the URL anyway.

lib/pleroma/web/mastodon_api/views/status_view.ex

@@ -166,7 +166,7 @@ def render("status.json", _) do
   def render("attachment.json", %{attachment: attachment}) do
     [attachment_url | _] = attachment["url"]
     media_type = attachment_url["mediaType"] || attachment_url["mimeType"] || "image"
-    href = attachment_url["href"]
+    href = attachment_url["href"] |> MediaProxy.url()
 
     type =
       cond do
@@ -180,9 +180,9 @@ def render("attachment.json", %{attachment: attachment}) do
 
     %{
       id: to_string(attachment["id"] || hash_id),
-      url: MediaProxy.url(href),
+      url: href,
       remote_url: href,
-      preview_url: MediaProxy.url(href),
+      preview_url: href,
       text_url: href,
       type: type,
       description: attachment["name"]

lib/pleroma/web/twitter_api/twitter_api.ex

@@ -3,6 +3,7 @@ defmodule Pleroma.Web.TwitterAPI.TwitterAPI do
   alias Pleroma.Web.ActivityPub.ActivityPub
   alias Pleroma.Web.TwitterAPI.UserView
   alias Pleroma.Web.{OStatus, CommonAPI}
+  alias Pleroma.Web.MediaProxy
   import Ecto.Query
 
   @instance Application.get_env(:pleroma, :instance)
@@ -97,7 +98,7 @@ def upload(%Plug.Upload{} = file, format \\ "xml") do
     {:ok, object} = ActivityPub.upload(file)
 
     url = List.first(object.data["url"])
-    href = url["href"]
+    href = url["href"] |> MediaProxy.url()
     type = url["mediaType"]
 
     case format do