Predict two-way levers (#25043)

* Predict two-way levers

Annoys me the rare occasions I touch cargo. Doesn't predict the signal but at least the lever responds immediately.

* space

* a

Content.Server/Disposal/Mailing/MailingUnitSystem.cs

@@ -4,6 +4,7 @@ using Content.Server.DeviceNetwork.Components;
 using Content.Server.DeviceNetwork.Systems;
 using Content.Server.Disposal.Unit.EntitySystems;
 using Content.Server.Power.Components;
+using Content.Shared.DeviceNetwork;
 using Content.Shared.Disposal;
 using Content.Shared.Interaction;
 using Robust.Server.GameObjects;