BUG - Invite spam crashes when invite is in DM

[Xarlos89]

Ignoring exception in on_message
Traceback (most recent call last):
  File "/usr/local/lib/python3.11/site-packages/discord/client.py", line 378, in _run_event
    await coro(*args, **kwargs)
  File "/usr/local/lib/python3.11/site-packages/zorak/cogs/admin/moderation_invites.py", line 92, in on_message
    await logs_channel.send(embed=log_message(message))
                                  ^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/zorak/cogs/admin/moderation_invites.py", line 54, in log_message
    description=f"Posted by {arg_message.author}\nIn {arg_message.channel.mention}",
                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'DMChannel' object has no attribute 'mention'

Error appears to happen when invite spam hits the DM channel of the bot and the user. We should handle this more gracefully