fx: 修复gen_emm $which_handlers 的逻辑

src/gen_emm.erl

@@ -341,7 +341,7 @@ epmCallMsg(Parent, ServerName, HibernateAfterTimeout, EpmHers, Debug, From, Requ
    NewDebug = ?SYS_DEBUG(Debug, ServerName, {call, From, Request}),
    case Request of
       '$which_handlers' ->
-         reply(From, EpmHers),
+         reply(From, maps:keys(EpmHers)),
          receiveIng(Parent, ServerName, HibernateAfterTimeout, EpmHers, NewDebug, false);
       {'$addEpm', EpmHandler, Args} ->
          {Reply, NewEpmHers, IsHib} = doAddEpm(EpmHers, EpmHandler, Args, undefined),