Rotation with custom time format not working

[alboyer]

When using a custom timestamp format for rotation naming, the timestamp format is used for the first file but not subsequent files. For example, the following code will produce the log files below.

Logger::with(LevelFilter::Info)
    .rotate(
        Criterion::Age(Age::Second),
        Naming::TimestampsCustomFormat {
            current_infix: None,
            format: "%Y%m%d_%H%M%S",
        },
        Cleanup::Never,
    )
    .log_to_file(FileSpec::default())
    .duplicate_to_stdout(Duplicate::All)
    .start()?;

rotate_20241019_094454.log
rotate_r2024-10-19_09-44-55.log
rotate_r2024-10-19_09-44-56.log

[emabee]

Fixed with 0.29.4. Thanks for the PR!