Raid: Avoid auto-mute when pinging + sending a message link

[AntoineJT]

In order to avoid this kind of false positive, I think we should add a whitelist domain list (maybe hardcode it in the module code, it doesn't matter) containing discord.com.

[AntoineJT]

Maybe some adjustment to the score calculation will be preferable instead.
The score should probably be decreased in case it has only one member ping in the message.

[Elanis]

https://github.com/DigitalPulseSoftware/NotaBot/blob/master/module_raid.lua#L798

This shouldn't happen anymore