Fix bug in ROS discovery data generation

The Payload Encapsulation was wrongly set to PL_CDR_BE

src/ros2/ros_config_package.vhd

@@ -67,7 +67,7 @@ package body ros_config_package is
         end if;
         
         -- Serialized Payload Header
-        ret.data(ret.length)    := PL_CDR_BE & x"0000";
+        ret.data(ret.length)    := CDR_BE & x"0000";
         ret.length              := ret.length + 1;
         -- ParticipantEntitiesInfo.gid
         gid := to_gid(to_guid(GUIDPREFIX,ENTITYID_PARTICIPANT));