moving im_end token in system message

Currently the system message only has `<|im_end|>` appended to the end if the tools argument is passed to the `apply_chat_template` method, because the token is placed within the `if xml_tools or python_tools or tools` logic. This should be moved after the `{%- endif -%}` statement so that it will always be appended to the end of the system message.

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 -%}