clean up

example/04_gemm_add_add_fastgelu/gemm_add_add_fastgelu_xdl_bf16_int8.cpp

@@ -91,12 +91,10 @@ struct PassThroughPack2
     constexpr const static bool is_pack2_invocable = true;
 };
 
-
 using PassThrough = ck::tensor_operation::element_wise::PassThrough;
-using AddFastGelu = ck::tensor_operation::element_wise::AddFastGelu;
 
 using AElementOp   = PassThrough;
-using BElementOp   = PassThroughPack2;
+using BElementOp   = PassThrough;
 using CDEElementOp = MultiplyAddFastGelu;
 
 static constexpr auto GemmSpec = ck::tensor_operation::device::GemmSpecialization::Default;