[BugFix] Fix misprint introduced by modular_kernel refactoring. (#28728)

Signed-off-by: Andrey Khalyavin <halyavin@yandex-team.ru>

Author: halyavin

vllm/model_executor/layers/fused_moe/modular_kernel.py

@@ -1060,7 +1060,7 @@ def input_chunk_range(chunk_idx: int) -> tuple[int, int]:
                 global_num_experts=global_num_experts,
                 expert_map=expert_map,
                 a1q_scale=_slice_scales(a1q_scale, s, e),
-                a2_scale=_slice_scales(self.fused_experts.a2_scale, e, e),
+                a2_scale=_slice_scales(self.fused_experts.a2_scale, s, e),
                 workspace13=workspace13,
                 workspace2=workspace2,
                 expert_tokens_meta=c_expert_tokens_meta,