New logging options do not save chosen format

[jmclicquennoi]

Brief summary of issue / Description of requested feature:

When using the new "Log options" in the General tab of the Profile preferences it no longer saves the options chosen for how and where to save files, and constantly reverts to "Named file (concatenate logs in one file)".

Steps to reproduce the issue / Reasons for adding feature:

1. Load profile
2. Alt+P to open options
3. Change the "Log format" dropdown away from "Named file (concatenate logs in one file)" to, e.g. "yyyy-MM-ddTHH-mm-ss (e.g. 1970-01-01T00-00-00.html)"
4. Save and close Mudlet
5. Reopen Mudlet
6. Load profile
7. Alt+P to open options
8. "Log format" dropdown has reverted back to "Named file (concatenate logs in one file)" (also, if logging is turned on, loading the profile will reveal it is logging to logfile.html instead of the chosen file again)

Error output / Expected result of feature

"Log format" should stay at whatever is selected, and not revert to "Named file (concatenate logs in one file)" constantly.

Extra information, such as Mudlet version, operating system and ideas for how to solve / implement:

Began in 3.10
Windows 10, reliably reproducible on my end
Ticking "Save log files in HTML format instead of plain text" does remain and work as expected

[SlySven]

Ah, the "mLogFileNameFormat" setting (a QString) is never written out in the XMLexport class - I bet the PR that start the improvements to the log file naming and save system was started before the one that improved (and made into a background thread) the save process but was not pulled into the development branch until the latter was finished. So saving the setting got lost in the conflict resolution...!

[SlySven]

... I'll roll a quick fix for this now. Marking as a medium bug because it is broken and needs fixing for the next minor release but it is not a fatal problem so not an urgent must fix immediate issue.

[SlySven]

Should be fixed now.