TD-5368 removing commented code

Author: rshrirohit

DigitalLearningSolutions.Web/Controllers/TrackingSystem/Centre/Administrator/AdministratorController.cs

@@ -7,7 +7,6 @@
     using DigitalLearningSolutions.Data.Models;
     using DigitalLearningSolutions.Data.Models.Common;
     using DigitalLearningSolutions.Data.Models.SearchSortFilterPaginate;
-    //using DigitalLearningSolutions.Data.Models.Supervisor;
     using DigitalLearningSolutions.Data.Models.User;
     using DigitalLearningSolutions.Web.Attributes;
     using DigitalLearningSolutions.Web.Helpers;