Fix broken test

Former-commit-id: fe1ad3d4658ad1f0fba85b2d5542647f7402d916
Former-commit-id: ec449be911a1e233e622aac48a1309cfa4e82a50
Former-commit-id: ed1eef3c2745a106a4f508d2632127d2216fa783

tests/ImageProcessorCore.Tests/Colors/ColorTests.cs

@@ -96,7 +96,7 @@ namespace ImageProcessorCore.Tests
         {
             const string First = "FF000000";
             Color color = Color.Black;
-            string second = color.GetPackedValue().ToString("X");
+            string second = color.PackedValue.ToString("X");
             Assert.Equal(First, second);
         }
     }