Fix #2020: Mark Modifier Letter (Lm category) characters as printable

ICSharpCode.Decompiler/CSharp/OutputVisitor/TextWriterTokenWriter.cs

@@ -416,7 +416,6 @@ namespace ICSharpCode.Decompiler.CSharp.OutputVisitor
 					return "\\u" + ((int)ch).ToString("x4");
 				default:
 					switch (char.GetUnicodeCategory(ch)) {
-						case UnicodeCategory.ModifierLetter:
 						case UnicodeCategory.NonSpacingMark:
 						case UnicodeCategory.SpacingCombiningMark:
 						case UnicodeCategory.EnclosingMark:
@@ -503,7 +502,6 @@ namespace ICSharpCode.Decompiler.CSharp.OutputVisitor
 					return true;
 			}
 			switch (char.GetUnicodeCategory(identifier, index)) {
-				case UnicodeCategory.ModifierLetter:
 				case UnicodeCategory.NonSpacingMark:
 				case UnicodeCategory.SpacingCombiningMark:
 				case UnicodeCategory.EnclosingMark: