update run_swebench_multimodal; improve logging message format for predictions file

Author: dcloud347

run_swebench_multimodal.py

@@ -195,7 +195,7 @@ def _run_instance(
         with file_lock:
             predictions_file.write(record + "\n")
             predictions_file.flush()
-        logger.info("Patch written to predictions for %s", instance_id)
+        logger.info(f"Patch written to {predictions_file} for %s", instance_id)
 
 
 def main() -> None: