[MC-144460] Wither Rose isn't damaging players in peaceful mode

Iirc, wither rose was supposed to give wither effect? wasn't it? anyway, it is doing nothing in this snapshot.

Environment

Windows 7, snapshot 19w08a

Cannot reproduce. Make sure you're not on Peaceful.

Confirmed in Peaceful mode; leaving open since we can't be sure on whether that is intended. It likely is, though.

Well, sorry about that, I forgot I was in peaceful mode.