fix flake8 standard problems

account/views/admin.py

@@ -151,7 +151,7 @@ class GenerateUserAPI(APIView):
             raw_data = f.read()
         os.remove(file_path)
         response = HttpResponse(raw_data)
-        response["Content-Disposition"] = f"attachment; filename=users.xlsx"
+        response["Content-Disposition"] = "attachment; filename=users.xlsx"
         response["Content-Type"] = "application/xlsx"
         return response
 

account/views/oj.py

@@ -305,7 +305,7 @@ class ApplyResetPasswordAPI(APIView):
         send_email_async.send(from_name=SysOptions.website_name_shortcut,
                               to_email=user.email,
                               to_name=user.username,
-                              subject=f"Reset your password",
+                              subject="Reset your password",
                               content=email_html)
         return self.success("Succeeded")