Fix item slots spawning entities on startup instead of map init (#5501)

* spawn item slot entities on map init not startup

* prevent locked state form destroying inheritance on save

* fix whitelist for booze dispenser

Content.Shared/Containers/ItemSlot/ItemSlotsComponent.cs

@@ -101,7 +101,7 @@ namespace Content.Shared.Containers.ItemSlots
         ///     This doesn't have to mean the slot is somehow physically locked. In the case of the item cabinet, the
         ///     cabinet may simply be closed at the moment and needs to be opened first.
         /// </remarks>
-        [DataField("locked")]
+        [DataField("locked", readOnly: true)]
         [ViewVariables(VVAccess.ReadWrite)]
         public bool Locked = false;