RichTextBox Rtf property wrong converting non ascii chars on Win10 with utf8 locale
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area-controls-RichEdit
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- C#
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Description
* .NET Core Version: **3.1.3**
* Have you experienced this same bug with .NET Framework?: **Yes**
**Problem description and Expected behavior:**

Note, due to other [bug](https://github.com/dotnet/winforms/issues/3032) in .net core (3.1.3), RichTextBox Rtf setter always trying to convert input through utf8, and therefor lead to same wrong output.
**Minimal repro:**
[Same](https://github.com/dotnet/winforms/files/4420952/WinFormsCoreTest2.zip) as in https://github.com/dotnet/winforms/issues/3032
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