Fix system message

chat_template.json

@@ -1,3 +1,3 @@
 {
-  "chat_template": "{% for message in messages %}{% if message['role'] == 'system' %}{{ message['content'][0]['text'] }}{% elif message['role'] == 'user' %}{{ '###Human: '}}{% else %}{{ '###' + message['role'].title() + ': '}}{% endif %}{# Render all images first #}{% for content in message['content'] | selectattr('type', 'equalto', 'image') %}{{ '<image>\n' }}{% endfor %}{# Render all text next #}{% for content in message['content'] | selectattr('type', 'equalto', 'text') %}{{ content['text'] }}{% endfor %}{% endfor %}{% if add_generation_prompt %}{{ '###Assistant:' }}{% endif %}"
+  "chat_template": "{% for message in messages %}{% if message['role'] == 'user' %}{{ '###Human: '}}{% elif message['role'] == 'assistant' %}{{ '###' + message['role'].title() + ': '}}{% endif %}{# Render all images first #}{% for content in message['content'] | selectattr('type', 'equalto', 'image') %}{{ '<image>\n' }}{% endfor %}{# Render all text next #}{% for content in message['content'] | selectattr('type', 'equalto', 'text') %}{{ content['text'] }}{% endfor %}{% endfor %}{% if add_generation_prompt %}{{ '###Assistant:' }}{% endif %}"
 }