902922: Fix playground issues

Author: GowthamPonrajSF5414

XlsIO-Excel-Protect-UnProtect/Protect-Workbook/.NET/Protect-Workbook/ProtectWorkbook/Data/InputWorkbook.xlsx

@@ -18,7 +18,6 @@ static void Main(string[] args)
                 IWorkbook workbook = application.Workbooks.Open(inputStream);
                 IWorksheet worksheet = workbook.Worksheets[0];
 
-                workbook.Unprotect();
                 //Protect workbook with password
                 workbook.Protect(true, true, "syncfusion");