fix lint

Author: yrobla

src/codegate/pipeline/base.py

@@ -270,7 +270,7 @@ def get_last_user_message_block(
         # Iterate in reverse to find the last block of consecutive 'user' messages
         for i in reversed(range(len(messages))):
             if messages[i]["role"] in accepted_roles:
-                content_str = messages[i].get("content")                
+                content_str = messages[i].get("content")
                 if content_str is None:
                     continue