Updated config file to remove special characters

params/mlc-chat-config.json

@@ -15,6 +15,5 @@
     "model_category": "llama",
     "model_name": "Llama-2-7b-chat-omniquant",
     "max_window_size": 4096,
-    "vocab_size": 32000
-  
+    "vocab_size": 32000 
 }