Make whitelist filter toggle available on /notifiers

[Ekwav]

It should be possible for users to enable whitelist notifier option so they can select targets to get sent auctions found by their whitelist

[matthias-luger]

Can you further explain this? What setting should be where and with what API request?

[Ekwav]

Can you further explain this? What setting should be where and with what API request?

Listener type 512 makes the system load the whitelist of the user as source
It should be possible for the user to create such an entry probably on the notification page