Revert "change the import slightly."

This reverts commit 16ddac0.

Author: omar-azzam00

file_server.py

@@ -1,6 +1,6 @@
 from flask import Flask, make_response, request, session, render_template, send_file, Response
 from flask.views import MethodView
-from werkzeug.utils import secure_filename
+from werkzeug import secure_filename
 from datetime import datetime
 import humanize
 import os