Change GetComponentIds as suggested by review

Author: brianpopow

src/ImageSharp/Formats/Jpeg/JpegEncoderCore.cs

@@ -33,16 +33,6 @@ internal sealed unsafe class JpegEncoderCore : IImageEncoderInternals
         /// </summary>
         private readonly byte[] buffer = new byte[20];
 
-        /// <summary>
-        /// The default component id's.
-        /// </summary>
-        private static readonly byte[] DefaultComponentIds = { 1, 2, 3 };
-
-        /// <summary>
-        /// Component id's for RGB colorspace.
-        /// </summary>
-        private static readonly byte[] RgbComponentIds = { 82, 71, 66 };
-
         /// <summary>
         /// The quality, that will be used to encode the image.
         /// </summary>
@@ -191,15 +181,9 @@ private static bool IsSupportedColorType(JpegColorType? colorType)
         /// For color space RGB this will be RGB as ASCII, otherwise 1, 2, 3.
         /// </summary>
         /// <returns>The component Ids.</returns>
-        private ReadOnlySpan<byte> GetComponentIds()
-        {
-            if (this.colorType == JpegColorType.Rgb)
-            {
-                return RgbComponentIds;
-            }
-
-            return DefaultComponentIds;
-        }
+        private ReadOnlySpan<byte> GetComponentIds() => this.colorType == JpegColorType.Rgb
+                ? new ReadOnlySpan<byte>(new byte[] { 82, 71, 66 })
+                : new ReadOnlySpan<byte>(new byte[] { 1, 2, 3 });
 
         /// <summary>
         /// Writes data to "Define Quantization Tables" block for QuantIndex.