[Listener] print_configuration(): fix verbose

The verbose level was displayed as a boolean when the program was
compiled without libconfuse.

owlps-listener/owlps-listenerd.c

@@ -697,7 +697,7 @@ void print_configuration()
           "my_position_y = %f\n"
           "my_position_z = %f\n"
 #endif // USE_PTHREAD
-          "verbose = %s\n"
+          "verbose = %"PRIuFAST8"\n"
           ,
           GET_MODE(),
           GET_AGGREGATION_IP(),
@@ -721,7 +721,7 @@ void print_configuration()
           GET_MY_POSITION_Y(),
           GET_MY_POSITION_Z(),
 #endif // USE_PTHREAD
-          OWL_BOOL_TO_STRING(GET_VERBOSE())
+          GET_VERBOSE()
           ) ;
 #endif // USE_CONFIG_FILE
 }