fix import line for PROD, more strict?

person.py

@@ -7,7 +7,7 @@ from sqlalchemy import Sequence
 from sqlalchemy.exc import SQLAlchemyError
 from status import st, Status
 from flask_login import login_required, current_user
-from werkzeug import secure_filename
+from werkzeug.utils import secure_filename
 from shared import GenFace, GenThumb
 from face import FaceRefimgLink
 import os