Remove plural BaseTurfs as a thing in favour of BaseTurf (#16560)

Content.Shared/Maps/ContentTileDefinition.cs

@@ -33,7 +33,8 @@ namespace Content.Shared.Maps
 
         [DataField("isSubfloor")] public bool IsSubFloor { get; private set; }
 
-        [DataField("baseTurfs")] public List<string> BaseTurfs { get; } = new();
+        [DataField("baseTurf")]
+        public string BaseTurf { get; } = string.Empty;
 
         [DataField("canCrowbar")] public bool CanCrowbar { get; private set; }
 

Content.Shared/Tiles/FloorTileSystem.cs

@@ -136,13 +136,7 @@ public sealed class FloorTileSystem : EntitySystem
 
     public bool HasBaseTurf(ContentTileDefinition tileDef, string baseTurf)
     {
-        foreach (var tileBaseTurf in tileDef.BaseTurfs)
-        {
-            if (baseTurf == tileBaseTurf)
-                return true;
-        }
-
-        return false;
+        return tileDef.BaseTurf == baseTurf;
     }
 
     private void PlaceAt(EntityUid user, MapGridComponent mapGrid, EntityCoordinates location, ushort tileId, SoundSpecifier placeSound, float offset = 0)