Update poster_id.html

previous code did not work

templates/post/poster_id.html

@@ -1,3 +1,7 @@
 {% if config.poster_ids %}
-	 ID: {{ post.ip|poster_id(post.id) }} 
+	{% if post.thread %}
+		 ID: {{ post.ip|poster_id(post.thread) }} 
+	{% else %}
+		 ID: {{ post.ip|poster_id(post.id) }} 
+	{% endif %}
 {% endif %}