Small changes to Choppa

[FairWeather]

Please consider the following small changes to Choppa (I guess they also apply to slayer):

- Change Last longa tactic from reducing rage cost by 15 to restoring 15 rage after an exhaustive blow has been used.
The reason is that skills like Try An Hurt me, Wild Chopping and Sit down don´t seem to work it it. They fully consume 100% of your rage, making the tactic´s usefulness very limited.

- Make Sit down an exhaustive blow that consumes up to 50 Rage. Having to wait until you have 75 rage is extremely slow.
From combat start, it may take up to 15 seconds before it is available, which in a fight is a very long time and it often ends being a waste of time, in particular in situation where someone jumps out of nowhere. The cooldown of this skills is long enough already, which prevents it from being spammed, which would be useless since a target would still be immune in the meantime.
Moreover, by consuming all Rage, it severely reduces outgoing DPS, which is something you most likely need when you have downed someone.
If necessary, the damage could be tweaked to match the rage consumption.

That´s all.