Add missing MagnetState attribute (#14715)

Content.Server/Salvage/SalvageMagnetComponent.cs

@@ -1,7 +1,7 @@
 using Content.Shared.Radio;
+using Content.Shared.Salvage;
 using Robust.Shared.GameStates;
 using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
-using Content.Shared.Salvage;
 
 namespace Content.Server.Salvage
 {
@@ -94,7 +94,8 @@ namespace Content.Server.Salvage
         public int PreviousCharge = 5;
 
     }
-    [CopyByRef]
+
+    [CopyByRef, DataRecord]
     public record struct MagnetState(MagnetStateType StateType, TimeSpan Until)
     {
         public static readonly MagnetState Inactive = new (MagnetStateType.Inactive, TimeSpan.Zero);