Removed obsolete Windows clipboard format CF_TEXT. (#20389)

src/Windows/Avalonia.Win32/ClipboardFormatRegistry.cs

@@ -30,7 +30,6 @@ namespace Avalonia.Win32
         static ClipboardFormatRegistry()
         {
             AddDataFormat(DataFormat.Text, (ushort)UnmanagedMethods.ClipboardFormat.CF_UNICODETEXT);
-            AddDataFormat(DataFormat.Text, (ushort)UnmanagedMethods.ClipboardFormat.CF_TEXT);
             AddDataFormat(DataFormat.File, (ushort)UnmanagedMethods.ClipboardFormat.CF_HDROP);
             AddDataFormat(DibDataFormat, (ushort)UnmanagedMethods.ClipboardFormat.CF_DIB);
             AddDataFormat(DibV5DataFormat, (ushort)UnmanagedMethods.ClipboardFormat.CF_DIBV5);

src/Windows/Avalonia.Win32/Interop/UnmanagedMethods.cs

@@ -2299,10 +2299,6 @@ namespace Avalonia.Win32.Interop
 
         public enum ClipboardFormat
         {
-            /// <summary>
-            /// Text format. Each line ends with a carriage return/linefeed (CR-LF) combination. A null character signals the end of the data. Use this format for ANSI text.
-            /// </summary>
-            CF_TEXT = 1,
             /// <summary>
             /// A handle to a bitmap
             /// </summary>