Some sobelow fixes

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/web/auth/error_handler.ex

@@ -4,6 +4,7 @@ defmodule Mobilizon.Web.Auth.ErrorHandler do
   """
   import Plug.Conn
 
+  # sobelow_skip ["XSS.SendResp"]
   def auth_error(conn, {type, _reason}, _opts) do
     body = Jason.encode!(%{message: to_string(type)})
     send_resp(conn, 401, body)