Update config.json

Added "tie_word_embeddings": false this is needed to return LM_HEAD layers in MLX

config.json

@@ -22,6 +22,7 @@
   "residual_dropout": 0.0,
   "rope_theta": 999999.4420358813,
   "sliding_window": 4096,
+  "tie_word_embeddings": false,
   "torch_dtype": "bfloat16",
   "transformers_version": "4.39.0.dev0",
   "use_bias": true,