Remove workaround for engine bug in disposals.

Content.Server/Disposal/Unit/Components/DisposalHolderComponent.cs

@@ -23,7 +23,6 @@ namespace Content.Server.Disposal.Unit.Components
     {
         public override string Name => "DisposalHolder";
 
-        private bool _deletionRequested = false;
         private Container _contents = null!;
 
         /// <summary>
@@ -113,7 +112,7 @@ namespace Content.Server.Disposal.Unit.Components
 
         public void ExitDisposals()
         {
-            if (_deletionRequested || Deleted)
+            if (Deleted)
                 return;
 
             PreviousTube = null;
@@ -144,9 +143,7 @@ namespace Content.Server.Disposal.Unit.Components
                 Air.Clear();
             }
 
-            // FIXME: This is a workaround for https://github.com/space-wizards/RobustToolbox/issues/1646
-            Owner.SpawnTimer(TimeSpan.Zero, () => Owner.Delete());
-            _deletionRequested = true;
+            Owner.Delete();
         }
 
         public void Update(float frameTime)