modified dashoboad Protocol Name

rel/files/plugins.config

@@ -18,7 +18,7 @@
 % ]},
 % {emqttd_dashboard, [
 %    {listener, 
-%        {http, 18083, [
+%        {emqttd_dashboard, 18083, [
 %            {acceptors, 4},
 %            {max_clients, 512}]}}
 % ]}