Edited Unassigned: compression choice is ignored [15251]

step to reproduce

create a new excel file and run this

```
Using exFile As New ExcelPackage(New FileInfo("c:\book1.xlsx"))

For row = 1 To 1000
For col = 1 To 100
exFile.Workbook.Worksheets("sheet1").Cells(row, col).Value = "aaaaaa"
Next
Next

exFile.Compression = CompressionLevel.None
exFile.SaveAs(New FileInfo("c:\book1-None.xlsx"))
End Using
```

steping into the code show that line 1939 of the file zipentry.write.cs, the if, CompressionLevel is still set to "default" even if "none" is specified