Update chat template to use reasoning if reasoning_content is unavailable, which is deprecated

chat_template.jinja

@@ -81,7 +81,7 @@
     {%- if thinking is defined and thinking is false -%}
     <think></think>{{render_content(message)}}
     {%- else -%}
-    {%- set rc = message.get('reasoning_content', '') -%}
+    {%- set rc = message.get('reasoning_content', '') or message.get('reasoning', '') -%}
     <think>{{rc}}</think>{{render_content(message)}}
     {%- endif -%}
     {%- if message.get('tool_calls') -%}