Removed invalid image from test suite

Author: Dmitry Pentin

tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.Images.cs

@@ -33,7 +33,6 @@ public partial class JpegDecoderTests
             TestImages.Jpeg.Issues.ExifGetString750Load,
             TestImages.Jpeg.Issues.ExifGetString750Transform,
             TestImages.Jpeg.Issues.BadSubSampling1076,
-            TestImages.Jpeg.Issues.ValidExifArgumentNullExceptionOnEncode,
 
             // LibJpeg can open this despite the invalid density units.
             TestImages.Jpeg.Issues.Fuzz.ArgumentOutOfRangeException825B,

tests/ImageSharp.Tests/Formats/Jpg/JpegEncoderTests.Metadata.cs

@@ -18,7 +18,7 @@ public partial class JpegEncoderTests
         public void Encode_WithValidExifProfile_DoesNotThrowException<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : unmanaged, IPixel<TPixel>
         {
-            Exception exception = Record.Exception(() =>
+            Exception ex = Record.Exception(() =>
             {
                 var encoder = new JpegEncoder();
                 var stream = new MemoryStream();
@@ -27,7 +27,7 @@ public void Encode_WithValidExifProfile_DoesNotThrowException<TPixel>(TestImageP
                 image.Save(stream, encoder);
             });
 
-            Assert.Null(exception);
+            Assert.Null(ex);
         }
     }
 }