Update app.py

app.py

@@ -75,7 +75,7 @@ def log(req: str = '', resp: str = ''):
         resp_element = ET.SubElement(element, "response")
         resp_element.text = resp
     
-        with open(destination_path, "ab+") as xml_file:
+        with open(DATA_FILE, "ab+") as xml_file:
             xml_file.write(ET.tostring(element, encoding="utf-8"))
         
         commit_url = repo.push_to_hub()