Fix candor rewards computing vs difficulty level

Does what advertised.

Candor rewards were meant to be scaled like (difficulty level / 2200) However, someone messed up operands order and it became inverted.

So it became 100 * 2200 / 4500 = 48 BP only. While it meant to be 100 * 4500 / 2200 = 204 BP instead.

This restores reward scaling into what it really meant to be.