fix(telemetry-ffi): Fix telemetry compilation after 802f06a (#1899)

Is this file not compiled at all, for some reason?

Co-authored-by: bob.weinand <bob.weinand@datadoghq.com>

Author: bwoebi

libdd-telemetry-ffi/src/builder/macros.rs

@@ -37,9 +37,9 @@ crate::c_setters!(
         host.kernel_version,
 
         runtime_id,
-        session_id,
-        parent_session_id,
-        root_session_id
+        config.session_id,
+        config.parent_session_id,
+        config.root_session_id
     }
 );