The field leaveOpen is not assigned in the CsvWriter constructor

[ravenyue]

Describe the bug
The field leaveOpen in the CsvWriter constructor is not assigned, causing the leaveOpen parameter to not work.

CsvHelper/src/CsvHelper/CsvWriter.cs

Line 89 in 701ede5

public CsvWriter(TextWriter writer, CultureInfo culture, bool leaveOpen = false) : this(writer, new CsvConfiguration(culture)) { }