Deal with multiple active infractions in database

While there are measures to prevent duplicate active infractions at
the side of the bot, there's no formal restriction at the sid of the
database. This means that it's possible for a user two get two active
ban infractions or two active mute infractions at the same time, for
instance after a manual table edit in Admin.

This leads to an inconsistent state when unmuting/unbanning that user,
as the ban or mute role will be removed on Discord, but only one of the
entries in the database would be set to inactive, while the other(s)
remain active. This means that an unmuted user will be remuted if they
leave and rejoin the Guild.

To handle this, I've inserted code that sets all the infractions to
inactive and cancels all related infraction tasks (in the case of
temporary infractions) when issuing an unban or unmute command. A note
will be added to the mod_log embed to notify us as well.

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