Fix issue in ExrImageFormatDetector.cs returning wrong format

src/ImageSharp/Formats/Exr/ExrImageFormatDetector.cs

@@ -3,7 +3,6 @@
 
 using System.Buffers.Binary;
 using System.Diagnostics.CodeAnalysis;
-using SixLabors.ImageSharp.Formats.Qoi;
 
 namespace SixLabors.ImageSharp.Formats.Exr;
 
@@ -29,7 +28,7 @@ public sealed class ExrImageFormatDetector : IImageFormatDetector
     /// <inheritdoc/>
     public bool TryDetectFormat(ReadOnlySpan<byte> header, [NotNullWhen(true)] out IImageFormat? format)
     {
-        format = this.IsSupportedFileFormat(header) ? QoiFormat.Instance : null;
+        format = this.IsSupportedFileFormat(header) ? ExrFormat.Instance : null;
         return format != null;
     }
 }

tests/ImageSharp.Tests/Formats/Exr/ImageExtensionsTest.cs

@@ -59,7 +59,7 @@ public class ImageExtensionsTest
     public async Task SaveAsExrAsync_Path_Encoder()
     {
         string dir = TestEnvironment.CreateOutputDirectory(nameof(ImageExtensions));
-        string file = Path.Combine(dir, "SaveAsExrAsync_Path_Encoder.tiff");
+        string file = Path.Combine(dir, "SaveAsExrAsync_Path_Encoder.exr");
 
         using (Image<Rgba32> image = new(10, 10))
         {