[V0 Deprecation] Remove VLLM_USE_V1 from tests (#26341)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

tests/samplers/test_no_bad_words.py

@@ -8,18 +8,11 @@ Run `pytest tests/samplers/test_no_bad_words.py`.
 
 from typing import Optional
 
-import pytest
 from transformers import AutoTokenizer
 
 from vllm import LLM, SamplingParams
 
 
-@pytest.fixture(autouse=True)
-def v1(monkeypatch):
-    """Only run on vLLM v1."""
-    monkeypatch.setenv("VLLM_USE_V1", "1")
-
-
 def _generate(
     llm: LLM,
     prompt: str,