Remove duplicate binding in router module

Author: auden-woolfson

presto-router/src/main/java/com/facebook/presto/router/RouterModule.java

@@ -106,8 +106,6 @@ protected void setup(Binder binder)
         binder.bind(RouterPluginManager.class).in(Scopes.SINGLETON);
         configBinder(binder).bindConfig(PluginManagerConfig.class);
 
-        configBinder(binder).bindConfig(PluginManagerConfig.class);
-
         bindHttpClient(binder, QUERY_PREDICTOR, ForQueryCpuPredictor.class, IDLE_TIMEOUT_SECOND, PREDICTOR_REQUEST_TIMEOUT_SECOND);
         bindHttpClient(binder, QUERY_PREDICTOR, ForQueryMemoryPredictor.class, IDLE_TIMEOUT_SECOND, PREDICTOR_REQUEST_TIMEOUT_SECOND);