### What this PR does / why we need it?
Update the check logic of reinitializing inputbatch, this is a follow-up
pr of #3477. `kernel_block_sizes` is a `list[list[int]]` and the
original logic will always update `InputBatch` when using hybrid blocks,
this pr fixes that
### How was this patch tested?
locally test with qwen3-next
- vLLM version: v0.11.0rc3
- vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.0
Signed-off-by: MengqingCao <cmq0113@163.com>
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