Deal skillShot bonus damage properly

src/main/java/com/gmail/nossr50/skills/archery/ArcheryManager.java

@@ -102,7 +102,7 @@ public class ArcheryManager extends SkillManager {
      */
     public void skillShot(LivingEntity target, double damage, Arrow arrow) {
         double damageBonusPercent = Math.min(((getSkillLevel() / Archery.skillShotIncreaseLevel) * Archery.skillShotIncreasePercentage), Archery.skillShotMaxBonusPercentage);
-        double archeryBonus = damage * damageBonusPercent;
+        double archeryBonus = (damage * damageBonusPercent) - damage;
 
         CombatUtils.dealDamage(target, archeryBonus, DamageCause.PROJECTILE, arrow, mcMMOPlayer, SkillType.ARCHERY);
     }