Fix broken test

tests/ImageSharp.Tests/TestUtilities/Tests/TestUtilityExtensionsTests.cs

@@ -114,15 +114,14 @@ namespace ImageSharp.Tests
         [Fact]
         public void ToTypes()
         {
-            PixelTypes pixelTypes = PixelTypes.Alpha8 | PixelTypes.Bgr565 | PixelTypes.Rgba32 | PixelTypes.HalfVector2 | PixelTypes.Rgba32;
+            PixelTypes pixelTypes = PixelTypes.Alpha8 | PixelTypes.Bgr565 | PixelTypes.HalfVector2 | PixelTypes.Rgba32;
 
             IEnumerable<KeyValuePair<PixelTypes, Type>> expanded = pixelTypes.ExpandAllTypes();
 
-            Assert.Equal(expanded.Count(), 5);
+            Assert.Equal(expanded.Count(), 4);
 
             AssertContainsPixelType<Alpha8>(PixelTypes.Alpha8, expanded);
             AssertContainsPixelType<Bgr565>(PixelTypes.Bgr565, expanded);
-            AssertContainsPixelType<Rgba32>(PixelTypes.Rgba32, expanded);
             AssertContainsPixelType<HalfVector2>(PixelTypes.HalfVector2, expanded);
             AssertContainsPixelType<Rgba32>(PixelTypes.Rgba32, expanded);
         }