Update text_generation.py

remove redundant `.tolist()` since it was already done above

tools/llm_bench/task/text_generation.py

@@ -324,7 +324,7 @@ def token_printer():
         num,
         iter_data,
         tm_list.tolist(),
-        inference_durations.tolist(),
+        inference_durations,
         warm_up=(num == 0),
         max_rss_mem=max_rss_mem_consumption,
         max_shared_mem=max_shared_mem_consumption,