Add logic for keeping follow_request_count up-to-date on the follow,

`approve_friend_request`, and `deny_friend_request` actions.
Add follow_request_count to the user view.

lib/pleroma/web/mastodon_api/mastodon_api_controller.ex

@@ -680,7 +680,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
          {:ok, _activity} <-
            ActivityPub.accept(%{
              to: [follower.ap_id],
-             actor: followed.ap_id,
+             actor: followed,
              object: follow_activity.data["id"],
              type: "Accept"
            }) do
@@ -702,7 +702,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
          {:ok, _activity} <-
            ActivityPub.reject(%{
              to: [follower.ap_id],
-             actor: followed.ap_id,
+             actor: followed,
              object: follow_activity.data["id"],
              type: "Reject"
            }) do