Log to file always JSON format

[kobi-wan]

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Description

I don't know if it's intentionally or not, but FTPgrab always saves the logfile in JSON format. The commandline flag --log-json just changes the output to screen, not to the file.
We just want to simply look at the logfile for errors. But JSON is harder to read. It would be better to have the normal log here for us.

Expected behaviour

If flag --log-json is set, it should log to JSON format, if not, it should log to normal format (for screen and file output),

Actual behaviour

Log to file is always in JSON format, no matter what.

Steps to reproduce

Just let FTPgrab output the log to file with --log-file=filename.log

FTPGrab version

7.11.0

Docker info

n/a

Docker Compose config

Logs

n/a

Additional info

No response