Killer drive spam clearance

[Krwak]

Summary

SUMMARY: [None] "Have killer drive inform about the withdrawal only once"

Purpose of change

Killer drive trait was informing player every 4 hours about the need to kill more monsters, giving random snippet from a list.
This is rather irritating after a while and is spamming the player.

Describe the solution

Changed the code in suffer.cpp so that it won't spam the player anymore. Code written by Kheir.
Game will check only once if there is a withdrawal and inform the player about it only once.

Describe alternatives you've considered

Delete the snippets from json file.

Testing

Compiled the game with the change, opened the game and made a new character with killer drive trait.
Killed a few zombies and then waited for a day to see how many snippets will the game offer.
The game offered only one snippet after 4 hours.
Tried this more times.

Additional context

[Coolthulhu]

Killer Drive morale stacking doesn't seem to be working. I waited a whole day and it's at -1.
The spam stopped happening, but I'd need a separate test to tell if it was broken or got broken here.

[Coolthulhu]

I tested it in mainline and it looks like the penalty is broken in both.