[BugFix]Fix incorrect get_current_vllm_config (#5121)

### What this PR does / why we need it?
This PR fixes some incorrect `get_current_vllm_config` calling, which
creates empty vllm_config instead.

### Does this PR introduce _any_ user-facing change?
No.

### How was this patch tested?

- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

---------

Signed-off-by: Angazenn <supperccell@163.com>

vllm_ascend/ascend_config.py

@@ -154,8 +154,7 @@ class AscendConfig:
         # npu_fused_infer_attention_score in some cases. We allow to execute
         # _npu_paged_attention in this cases. This should be removed once
         # npu_fused_infer_attention_score performs better on all scenarios.
-        self.pa_shape_list = additional_config.get("pa_shape_list",
-                                                   [1, 2, 3, 4])
+        self.pa_shape_list = additional_config.get("pa_shape_list", [])
 
         kv_cfg = vllm_config.kv_transfer_config
         if kv_cfg is not None and not getattr(kv_cfg, "_engine_id_patched",