Use message.reasoning when found

VLLM has removed reasoning_content https://github.com/vllm-project/vllm/pull/33402

chat_template.jinja

@@ -43,6 +43,8 @@ For each function call, output the function name and arguments within the follow
 {%- set content = visible_text(m.content) %}
 {%- if m.reasoning_content is string %}
     {%- set reasoning_content = m.reasoning_content %}
+{%- elif m.reasoning is string %}
+    {%- set reasoning_content = m.reasoning %}
 {%- else %}
     {%- if '</think>' in content %}
         {%- set reasoning_content = content.split('</think>')[0].rstrip('\n').split('<think>')[-1].lstrip('\n') %}