Some minor Warwick fixes

Not sure how relevant this is with the probable rework coming but there are a few things i noticed while experimenting with Warwick that i think should be fixed for the short term.

1)I don't know if I'm just imagining this but it feels like there's a wind up period after he activates his W (AS steroid) before he starts attacking at full speed. The cool down between attacks is a bit longer for the first 2 attacks.

2)His passive stacks reset when he changes targets. He can be attacking a target and get all 3 stacks of his passive on and then the moment he strikes a new entity, his passive will reset to 1. Pretty sure this was not intended as the stacks are on himself and not his target.