### What this PR does / why we need it?
Fix TTFT degradation on Deepseek-V3.1-W4A8. Revert change of
`balance_flag` in https://github.com/vllm-project/vllm-ascend/pull/7611.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
- vLLM version: v0.18.0
Signed-off-by: Wangbingjie <wangbj1207@126.com>