Knock Off behaves inaccurately compared to vanilla

[njdeliberto]

Used Knock off on Lyra’s bayleaf, who was holding a berry. The attack damaged the pokemon into berry proc territory, and the berry activated, healing the Pokemon. The berry should have been knocked off

Opponent used knock off on my slowbro which was holding a rocky helmet. Rocky helmet was removed but no damage was done to opponent

[FredrIQ]

Due to how I currently handle Berries and Rocky Helmet, this would require refactoring the general post-hit sequence, so I'm marking this as an enhancement, since there's nothing wrong with the current mechanics beyond being inaccurate.