Add <|im_end|> to system role

chat_template.jinja

@@ -64,8 +64,8 @@
       {{- python_tool_string -}}
     {%- endif -%}
     {{- "\n\n" -}}
-    {{- "<|im_end|>\n" -}}
   {%- endif -%}
+  {{- "<|im_end|>\n" -}}
 {%- endif -%}
 {# ───── main loop ───── #}
 {%- for message in messages -%}