Apply suggestions from code review

Co-authored-by: Ilyas Moutawwakil <57442720+IlyasMoutawwakil@users.noreply.github.com>

Author: eaidova

optimum/exporters/openvino/model_configs.py

@@ -2640,7 +2640,7 @@ def patch_model_for_export(
     def inputs(self):
         common_inputs = super().inputs
         if getattr(self, "stateful", False) and self._behavior == ConfigBehavior.DECODER:
-            common_inputs["decoder_input_ids"] = {0: "batch_size", 1: "seq_length"}
+            common_inputs["decoder_input_ids"] = {0: "batch_size", 1: "decoder_sequence_length"}
         return common_inputs
 
 
@@ -2661,7 +2661,7 @@ def patch_model_for_export(
     def inputs(self):
         common_inputs = super().inputs
         if getattr(self, "stateful", False) and self._behavior == ConfigBehavior.DECODER:
-            common_inputs["decoder_input_ids"] = {0: "batch_size", 1: "seq_length"}
+            common_inputs["decoder_input_ids"] = {0: "batch_size", 1: "decoder_sequence_length"}
         return common_inputs