[HLSCustomOp] fix Thresholding op to use new interface convention

src/finn/custom_op/fpgadataflow/thresholding_batch.py

@@ -825,8 +825,8 @@ class Thresholding_Batch(HLSCustomOp):
             # create a hierarchy for this layer, with the same port names
             clk_name = self.get_verilog_top_module_intf_names()["clk"][0]
             rst_name = self.get_verilog_top_module_intf_names()["rst"][0]
-            dout_name = self.get_verilog_top_module_intf_names()["m_axis"][0]
-            din_name = self.get_verilog_top_module_intf_names()["s_axis"][0]
+            dout_name = self.get_verilog_top_module_intf_names()["m_axis"][0][0]
+            din_name = self.get_verilog_top_module_intf_names()["s_axis"][0][0]
             cmd.append("create_bd_cell -type hier %s" % node_name)
             cmd.append("create_bd_pin -dir I -type clk /%s/%s" % (node_name, clk_name))
             cmd.append("create_bd_pin -dir I -type rst /%s/%s" % (node_name, rst_name))