Fix remaining f-string log call in OG2 train_fsdp2.py

Missed one logger.info(f"...") call during the earlier style pass.
Convert to %-formatting for consistency with the other recipes' lazy
log evaluation pattern.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Timur Rvachov <trvachov@nvidia.com>

Author: trvachov

bionemo-recipes/recipes/opengenome2_mixtral_native_te/train_fsdp2.py

@@ -351,7 +351,7 @@ def main(args: DictConfig) -> float | None:
     if val_enabled:
         val_data_path = getattr(val_config, "data_path", None)
         if val_data_path:
-            logger.info(f"Setting up validation dataloader from {val_data_path}")
+            logger.info("Setting up validation dataloader from %s", val_data_path)
             val_dataset_kwargs = OmegaConf.to_container(args.dataset, resolve=True)
             val_dataset_kwargs["load_dataset_kwargs"] = {
                 "path": "json",