fix get_input_embdeddings

fixes
` File "/root/.cache/huggingface/modules/transformers_modules/stabilityai/stablelm-3b-4e1t/a4750ace0db6f08d7bbba0aa52a585f231ea3cde/modeling_stablelm_epoch.py", line 552, in get_input_embeddings
return self.transformer.embed_tokens`

modeling_stablelm_epoch.py

@@ -549,7 +549,7 @@ class StableLMEpochForCausalLM(StableLMEpochPreTrainedModel):
         self.post_init()
 
     def get_input_embeddings(self):
-        return self.transformer.embed_tokens
+        return self.model.embed_tokens
 
     def set_input_embeddings(self, value):
         self.model.embed_tokens = value