[BUG] Changing logging channel doesn't remove old channel

[wakfi]

Describe the bug
When logging is enabled already for a log type, if you run the command again and give a different channel, the logs for the type will be sent to both channels.

To Reproduce
Steps to reproduce the behavior:

1. Run !cfg logging message_logs <some channel>
2. Delete or edit a message and see it logged in the channel
3. Run !cfg logging message_logs <some_other_channel>
4. Delete or edit a message and see it logged in both channels

Expected behavior
Logs are no longer sent to the old channel, only the new one

Additional context
Is this actually a feature?

[y3ll0wlife]

CNR on TS 3.2.0.5 (bbd8c8c) build #bbd8c8c

[KlukCZ]

CNR, this should not even be possible as the logging channel is not an array in the database nor does the logger loop through all the channels

[wakfi]

CNLR. See #215 for alternate, related issue