Fix AttributeError: DeepseekV4MegaMoEExperts has no swiglu_limit

Get swiglu_limit from vllm_config.model_config.hf_config instead
of self (it was only set on the parent DeepseekV4MoE class).

vllm/patches/deepseek_v4.py

@@ -251,6 +251,7 @@ class DeepseekV4MegaMoEExperts(nn.Module):
         self.hidden_size = hidden_size
         self.intermediate_size = intermediate_size
         self.max_num_tokens = vllm_config.scheduler_config.max_num_batched_tokens
+        self.swiglu_limit = vllm_config.model_config.hf_config.swiglu_limit
 
         weight_attrs = {"weight_loader": self.weight_loader}