Minor update of run_call_with_unpacked_inputs (#18541)

Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>

src/transformers/modeling_tf_utils.py

@@ -398,7 +398,7 @@ def run_call_with_unpacked_inputs(self, *args, **kwargs):
         fn_args_and_kwargs.update(dict(zip(func.__code__.co_varnames[1:], args)))
 
         # Encoder Decoder models delegate the application of the configuration options to their inner models.
-        if "encoder_decoder" in str(self).lower():
+        if "EncoderDecoder" in self.__class__.__name__:
             config = None
         else:
             config = self.config