[CI/Build] Fix wrong path in Transformers Nightly Models Test (vllm-project#20994)

Signed-off-by: DarkLight1337 <[email protected]>
Signed-off-by: Diego-Castan <[email protected]>

Author: DarkLight1337

.buildkite/test-pipeline.yaml

@@ -645,7 +645,7 @@ steps:
   optional: true
   commands:
     - pip install --upgrade git+https://github.com/huggingface/transformers
-    - pytest -v -s models/test_initialization.py
+    - pytest -v -s tests/models/test_initialization.py
     - pytest -v -s tests/models/multimodal/processing/
     - pytest -v -s tests/models/multimodal/test_mapping.py
     - python3 examples/offline_inference/basic/chat.py