BmpEncoder uses Octree as default

src/ImageSharp/Formats/Bmp/BmpEncoder.cs

@@ -2,7 +2,6 @@
 // Licensed under the Six Labors Split License.
 
 using SixLabors.ImageSharp.Advanced;
-using SixLabors.ImageSharp.Processing;
 
 namespace SixLabors.ImageSharp.Formats.Bmp;
 
@@ -11,11 +10,6 @@ namespace SixLabors.ImageSharp.Formats.Bmp;
 /// </summary>
 public sealed class BmpEncoder : QuantizingImageEncoder
 {
-    /// <summary>
-    /// Initializes a new instance of the <see cref="BmpEncoder"/> class.
-    /// </summary>
-    public BmpEncoder() => this.Quantizer = KnownQuantizers.Wu;
-
     /// <summary>
     /// Gets or sets the number of bits per pixel.
     /// </summary>