Add Serializable, NetSerializable attributes to DecalPaintMode (#38921)

Serializable, Net" on DecalPaintMode

Content.Shared/SprayPainter/Components/SprayPainterComponent.cs

@@ -2,6 +2,7 @@ using Content.Shared.Decals;
 using Robust.Shared.Audio;
 using Robust.Shared.GameStates;
 using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization;
 
 namespace Content.Shared.SprayPainter.Components;
 
@@ -109,6 +110,7 @@ public sealed partial class SprayPainterComponent : Component
 /// <summary>
 /// A set of operating modes for decal painting.
 /// </summary>
+[Serializable, NetSerializable]
 public enum DecalPaintMode : byte
 {
     /// <summary>