fixes strength

Strength 1 is currently stronger than Strength 2, and the damage dealt is inaccurate. Not sure if this is a result of Humbug not being updated for the latest Strength changes (+130%/+260% damage increase) or just a bug. Strength now deals 1.5 extra damage per tier (pre-1.6 values).

This reversion means that (a) Strength 1 is no longer stronger than Strength 2 and (b) Strength in general does less damage (tier-2 now does slightly less damage than tier-1 used to).