chore: make xref happy

apps/emqx_modules/src/emqx_modules_app.erl

@@ -36,7 +36,6 @@ maybe_enable_modules() ->
     emqx_conf:get([delayed, enable], true) andalso emqx_delayed:enable(),
     emqx_conf:get([telemetry, enable], true) andalso emqx_telemetry:enable(),
     emqx_conf:get([observer_cli, enable], true) andalso emqx_observer_cli:enable(),
-    emqx_event_message:enable(),
     emqx_conf_cli:load(),
     ok = emqx_rewrite:enable(),
     emqx_topic_metrics:enable(),
@@ -46,7 +45,6 @@ maybe_disable_modules() ->
     emqx_conf:get([delayed, enable], true) andalso emqx_delayed:disable(),
     emqx_conf:get([telemetry, enable], true) andalso emqx_telemetry:disable(),
     emqx_conf:get([observer_cli, enable], true) andalso emqx_observer_cli:disable(),
-    emqx_event_message:disable(),
     emqx_rewrite:disable(),
     emqx_conf_cli:unload(),
     emqx_topic_metrics:disable(),

apps/emqx_modules/src/emqx_modules_sup.erl

@@ -39,7 +39,6 @@ start_link() ->
 %% Supervisor callbacks
 %%--------------------------------------------------------------------
 init([]) ->
-    emqx_event_message:init_conf_handler(),
     {ok,
         {{one_for_one, 10, 3600}, [
             ?CHILD(emqx_telemetry),