Change the defaults for logging

Change the defaults for logging

Turn on the logging by default for everyone. Let's use a log dir within
the config directory of the application and have debug logs expiring
after a day.

This obviously means we'll generate quite some logs but with the
automated compression it shouldn't be too horrible. Obviously that
scales with the amount of files and syncs occurring. In our tests with a
large setup we're around 100 MB for a day worth of logs, this shouldn't
be too much of an issue on today's average desktop/laptop.

Signed-off-by: Kevin Ottens <kevin.ottens@nextcloud.com>