[Bugifx] fix quant_apply_mlp w1_scale type error & fix getting num_local_expert (#4632)

### What this PR does / why we need it?
Fix bugs introduced by
bc67696a02
1. fix getting num_local_experet error in vllm_adaptor
2. fix w1_scale type error in
moe_mlp.quant_apply_mlp.npu_dequant_swiglu_quant in w4a8 quantized
scenario

- vLLM version: v0.12.0

---------

Signed-off-by: 白永斌 <baiyongbin3@h-partners.com>
Signed-off-by: 欧派果奶我还要 <47294568+845473182@users.noreply.github.com>
Co-authored-by: 白永斌 <baiyongbin3@h-partners.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: wangxiyuan <wangxiyuan1007@gmail.com>

vllm_ascend/eplb/adaptor/vllm_adaptor.py

@@ -107,8 +107,8 @@ class VllmEplbAdaptor(EplbAdaptor):
                 self.buffer_tensor_list[buffer_id].append(buffer_tensor)
 
     def init_expert_param_per_layer(self):
-        num_local_expert = self.param_dict["model.layers." + str(self.num_dense_layers) + \
-                                           ".mlp.experts." + self.expert_weight_names[0]].data.shape[0]
+        key = f"model.layers.{self.num_dense_layers}.mlp.experts.{self.expert_weight_names[0]}"
+        num_local_expert = len(self.param_dict[key])
         for moe_layer_id in range(self.num_moe_layers):
             layer_idx = self.num_dense_layers + moe_layer_id
             self.expert_param_per_layer[layer_idx] = list()