### What this PR does / why we need it?
This pull request addresses a linting issue by reordering a specific
configuration assignment within the `apply_config_platform_defaults`
method in `vllm_ascend/platform.py`. This change ensures compliance with
code style guidelines without altering the functional behavior of the
system.
### Does this PR introduce _any_ user-facing change?
### How was this patch tested?
- vLLM version: v0.18.0
- vLLM main:
ed359c497a
Signed-off-by: Wang Kunpeng <1289706727@qq.com>