Update chat template so that the default and the non-supported reasoning mode defaults to the same high reasoning mode

chat_template.jinja

@@ -129,6 +129,6 @@
     {%- elif effort == 'low' %}
         {{- '<|im_start|>assistant\n<think_faster>\n' }}
     {%- else %}
-        {{- '<|im_start|>assistant\n<think_fast>\n' }}
+        {{- '<|im_start|>assistant\n<think>\n' }}
     {%- endif %}
 {%- endif %}