QOL change for Lucian

Let me start by saying I think his damage is fine the way it is, and I wouldn't recommend changing it. However, I think it's stupid that even the smallest cc/displacement can interrupt his ult and he eats the full cooldown. So this is what I propose for Lucian. If Lucian's ult is interrupted, or if he cancels it early, the cooldown is based on how many bullets were left when the ult ended.