Set enable_int8 for conv2d_transpose, test=develop (#4078)

lite/core/mir/fusion/quant_dequant_op_fuser.cc

@@ -175,6 +175,7 @@ void DequantOpFuser::InsertNewNode(SSAGraph* graph,
   for (int i = 0; i < weight_scale_size; i++) {
     weight_scale.push_back(whole_weight_scale);
   }
+
   op_desc.SetAttr("enable_int8", true);
   op_desc.SetInputScale(weight_name, weight_scale);
 
@@ -280,9 +281,8 @@ void ChannelWiseDequantOpFuser::InsertNewNode(SSAGraph* graph,
     op_desc.SetInput("X", {quantized_op_input->arg()->name});
     op_desc.SetOutput("Out", {dequant_op_out->arg()->name});
   }
-  if (quantized_op_type_ != "conv2d_transpose") {
-    op_desc.SetAttr("enable_int8", true);
-  }
+
+  op_desc.SetAttr("enable_int8", true);
   op_desc.SetInputScale(weight_name, weight_scale);
 
   // change the weight from the float type to int8 type.