remove prefix bos_token from messages when using lmdeploy as the accelerator

[lvhan028]

…lerator

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[zhulinJulia24]

use opencompass (before pr1198) and this pr to do evaluation (batch_size = 1): opencompass (before pr1198) : https://github.com/InternLM/lmdeploy/actions/runs/11251926631 this pr: https://github.com/zhulinJulia24/lmdeploy/actions/runs/11401587215 there scores and predictions are the same.