fix ifdefs

realsense2_camera/src/dynamic_params.cpp

@@ -103,7 +103,9 @@ namespace realsense2_camera
         try
         {
             ROS_DEBUG_STREAM("setParam::Setting parameter: " << param_name);
-#if defined(GALACTIC) || defined(HUMBLE) || defined(ROLLING)
+#if defined(DASHING) || defined(ELOQUENT) || defined(FOXY)
+            //do nothing for old versions
+#else
             descriptor.dynamic_typing=true; // Without this, undeclare_parameter() throws in Galactic onward.
 #endif
             if (!_node.get_parameter(param_name, result_value))