Make the robusted donuts cost 2 utility credits

[alexandregtg]

Not a fan of this, I think the donuts are fine. Taking down security should be challenge, and most antags have plenty of tools that can achieve this if you are clever. I don't think its a problem on RP, and on classic i've seen antags destroy everything so the balance seems fine imo. I fear it would just lead to more sec officers rushing medical supplies at roundstart which is not a good thing