Initialize captcha system after loading modules and external modules

Since recently, ejabberd_captcha instead of a script may use a module,
for example the external module mod_ecaptcha, which must be loaded first.

src/ejabberd_captcha.erl

@@ -294,7 +294,7 @@ init([]) ->
     case check_captcha_setup() of
 	true ->
 	    register_handlers(),
-	    ejabberd_hooks:add(config_reloaded, ?MODULE, config_reloaded, 50),
+	    ejabberd_hooks:add(config_reloaded, ?MODULE, config_reloaded, 70),
 	    {ok, #state{enabled = true}};
 	false ->
 	    {ok, #state{enabled = false}};

src/ejabberd_sup.erl

@@ -61,9 +61,9 @@ init([]) ->
 	   simple_supervisor(ejabberd_s2s_out),
 	   worker(ejabberd_s2s),
 	   simple_supervisor(ejabberd_service),
-	   worker(ejabberd_captcha),
 	   worker(ext_mod),
 	   supervisor(ejabberd_gen_mod_sup, gen_mod),
+	   worker(ejabberd_captcha),
 	   worker(ejabberd_acme),
 	   worker(ejabberd_auth),
 	   worker(ejabberd_oauth),