[chore] fix fused_moe_layer DefaultMoERunner

[co63oc]

Purpose

vllm-project/vllm#40560 已合并 MoERunnerBase + DefaultMoERunner 为 MoERunner
当前PR修改 import 路径

gitee 上vllm最新版本为 0.17.0，运行测试代码错误，暂未验证修改

from vllm import LLM, SamplingParams
llm = LLM(model="Qwen/Qwen2.5-0.5B-Instruct")
sampling_params = SamplingParams(temperature=0.8, top_p=0.95, max_tokens=256)
prompts = [
    "Hello, my name is",
]
outputs = llm.generate(prompts, sampling_params)
for prompt, output in zip(prompts, outputs):
    print(f"Prompt: {prompt}")
    print(f"Output: {output.outputs[0].text}")
    print("-" * 50)

输出错误信息

Test Plan

Test Result

(Optional) Documentation Update

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Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.

[gemini-code-assist]

Code Review

This pull request updates the import in fused_moe_layer.py to import MoERunner as DefaultMoERunner from vllm.model_executor.layers.fused_moe.runner.moe_runner instead of importing DefaultMoERunner from default_moe_runner. There are no review comments, and I have no additional feedback to provide.

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