Un-revert IPlayerManager refactor (#21244)

Content.Server/Administration/Commands/DeAdminCommand.cs

@@ -1,10 +1,8 @@
 using Content.Server.Administration.Managers;
 using Content.Shared.Administration;
 using JetBrains.Annotations;
-using Robust.Server.Player;
 using Robust.Shared.Console;
 
-
 namespace Content.Server.Administration.Commands
 {
     [UsedImplicitly]
@@ -17,7 +15,7 @@ namespace Content.Server.Administration.Commands
 
         public void Execute(IConsoleShell shell, string argStr, string[] args)
         {
-            var player = shell.Player as IPlayerSession;
+            var player = shell.Player;
             if (player == null)
             {
                 shell.WriteLine("You cannot use this command from the server console.");