Update configuration_h2ovl_chat.py

Changing the architecture for compliance with updated transformers.

configuration_h2ovl_chat.py

@@ -44,7 +44,7 @@ class H2OVLChatConfig(PretrainedConfig):
             logger.info('vision_config is None. Initializing the InternVisionConfig with default values.')
 
         if llm_config is None:
-            llm_config = {'architectures': ['LlamaForCausalLM']}
+            llm_config = {'architectures': ['MistralForCausalLM']}
             logger.info('llm_config is None. Initializing the LlamaConfig config with default values (`LlamaConfig`).')
 
         self.vision_config = InternVisionConfig(**vision_config)