Fix real-time events on AWS

apps/block_scout_web/config/prod.exs

@@ -17,6 +17,7 @@ config :block_scout_web, BlockScoutWeb.Endpoint,
   cache_static_manifest: "priv/static/cache_manifest.json",
   force_ssl: false,
   secret_key_base: System.get_env("SECRET_KEY_BASE"),
+  check_origin: ["//*.blockscout.com", "//*.elb.amazonaws.com"],
   http: [port: System.get_env("PORT")],
   url: [
     scheme: "http",