Fix ModelPatcher returns empty outputs (#2109)

* fix bug `ModelPatcher` returns empty outputs

When model's output is tuple or list, `filtered_outputs`
doesn't get assigned and hence always a empty dict

* typo

---------

Co-authored-by: Ella Charlaix <80481427+echarlaix@users.noreply.github.com>

Author: LoSealL

optimum/exporters/onnx/model_patcher.py

@@ -168,7 +168,7 @@ def patched_forward(*args, **kwargs):
                         filterd_outputs[name] = value
             elif isinstance(outputs, (list, tuple)):
                 outputs_list = list(config.outputs.keys())
-                dict(zip(outputs_list, outputs))
+                filterd_outputs = dict(zip(outputs_list, outputs))
             else:
                 if len(config.outputs) > 1:
                     num_outputs = len(config.outputs)