Fix Controller.render/4 deprecation

lib/pleroma/web/mastodon_api/mastodon_api_controller.ex

@@ -844,7 +844,7 @@ def favourited_by(%{assigns: %{user: user}} = conn, %{"id" => id}) do
 
       conn
       |> put_view(AccountView)
-      |> render(AccountView, "accounts.json", %{for: user, users: users, as: :user})
+      |> render("accounts.json", %{for: user, users: users, as: :user})
     else
       _ -> json(conn, [])
     end