[releases/v0.18.0][bugfix][eplb] remove unnecessary weight_scale wrap behaviour (#7732)

### What this PR does / why we need it?
This PR simplifies the apply method in w8a8_dynamic.py by removing the
conditional logic that used fused_w1_scale and fused_w2_scale based on
the fused_scale_flag. This redundant wrap behavior leads to EPLB break
in int8 quantization scenarios.

Cherry-picked from #7188. Note that only bugfix lines in that PR are
picked.

Signed-off-by: linfeng-yuan <1102311262@qq.com>

vllm_ascend/quantization/methods/w8a8_dynamic.py

@@ -267,8 +267,8 @@ class AscendW8A8DynamicFusedMoEMethod(AscendMoEScheme):
                 log2phy=log2phy,
                 pertoken_scale=pertoken_scale,
                 activation=activation,
-                w1_scale=[layer.fused_w1_scale] if fused_scale_flag else w1_scale,
-                w2_scale=[layer.fused_w2_scale] if fused_scale_flag else w2_scale,
+                w1_scale=w1_scale,
+                w2_scale=w2_scale,
             )
         )
         if zero_expert_num > 0 and zero_expert_type is not None: