Remove Explicit GridId References (#8315)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Client/IconSmoothing/IconSmoothComponent.cs

@@ -1,5 +1,4 @@
 using JetBrains.Annotations;
-using Robust.Shared.Map;
 
 namespace Content.Client.IconSmoothing
 {
@@ -14,7 +13,7 @@ namespace Content.Client.IconSmoothing
     [RegisterComponent]
     public sealed class IconSmoothComponent : Component
     {
-        public (GridId, Vector2i)? LastPosition;
+        public (EntityUid, Vector2i)? LastPosition;
 
         /// <summary>
         ///     We will smooth with other objects with the same key.