style(moss_tts_nano): ruff-format on_requests_finished log call

Signed-off-by: Yueqian Lin <linyueqian@outlook.com>

vllm_omni/model_executor/models/moss_tts_nano/modeling_moss_tts_nano.py

@@ -450,9 +450,7 @@ class MossTTSNanoForGeneration(nn.Module):
                 try:
                     gen.close()
                 except Exception:
-                    logger.exception(
-                        "MOSS-TTS-Nano failed to close stream gen for request %s", req_id
-                    )
+                    logger.exception("MOSS-TTS-Nano failed to close stream gen for request %s", req_id)
 
     # ------------------------------------------------------------------
     # AR runner interface