Remove all references to yapf as it's no longer used (#26251)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

vllm/engine/arg_utils.py

@@ -1,7 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
-# yapf: disable
 import argparse
 import copy
 import dataclasses
@@ -88,8 +87,6 @@ from vllm.transformers_utils.utils import check_gguf_file
 from vllm.utils import FlexibleArgumentParser, GiB_bytes, get_ip, is_in_ray_actor
 from vllm.v1.sample.logits_processor import LogitsProcessor
 
-# yapf: enable
-
 if TYPE_CHECKING:
     from vllm.executor.executor_base import ExecutorBase
     from vllm.model_executor.layers.quantization import QuantizationMethods