Fix incorrect EntityPath.Lookup exception message

src/gaemstone.ECS/EntityPath.cs

@@ -150,10 +150,9 @@ public class EntityPath
 
 				var startStr = EntityRef.CreateOrNull(world, start)?.GetFullPath().ToString() ?? start.ToString();
 				throw new World.EntityNotFoundException(
-					  (start == parent) ? $"Child entity of '{startStr}' at '{path}' not found"
-					:  start.IsSome     ? $"Entity at scope '{startStr}' at '{path}' not found"
-					                    : $"Entity at '{path}' not found"
-				);
+					   start.IsNone     ? $"Entity at '{path}' not found"
+					: (start == parent) ? $"Child entity of '{startStr}' at '{path}' not found"
+					                    : $"Entity at scope '{startStr}' at '{path}' not found");
 			}
 
 		return current;