Fixed Might & Aim bug

Realized that Might and Aim have not been adding damage correctly. They
have both been skipping a good half of base damage when giving their
percentage bonus.

This is why Might and Aim have been useless all these years. They haven't
been including the 5 base damage from a player's Mastery because of a typo.
Therefore the stats' bonuses have been reduced by half or more.