Remove unused properties.

Author: JimBobSquarePants

src/ImageSharp.Drawing/Processing/TextGraphicsOptions.cs

@@ -40,11 +40,6 @@ private TextGraphicsOptions(TextGraphicsOptions source)
             this.VerticalAlignment = source.VerticalAlignment;
         }
 
-        /// <summary>
-        /// Gets the default <see cref="TextGraphicsOptions"/> instance.
-        /// </summary>
-        public static TextGraphicsOptions Default { get; } = new TextGraphicsOptions();
-
         /// <summary>
         /// Gets or sets a value indicating whether antialiasing should be applied.
         /// Defaults to true.

src/ImageSharp/GraphicsOptions.cs

@@ -29,11 +29,6 @@ private GraphicsOptions(GraphicsOptions source)
             this.ColorBlendingMode = source.ColorBlendingMode;
         }
 
-        /// <summary>
-        /// Gets the default <see cref="GraphicsOptions"/> instance.
-        /// </summary>
-        public static GraphicsOptions Default { get; } = new GraphicsOptions();
-
         /// <summary>
         /// Gets or sets a value indicating whether antialiasing should be applied.
         /// Defaults to true.