Make damageReduction reduce damage.

Swap the addition for subtraction, so more invigoration points will multiply the damage by a lower percentage.

eco-core/core-plugin/src/main/java/com/willfp/ecoenchants/enchantments/ecoenchants/normal/Invigoration.java

@@ -41,7 +41,7 @@ public class Invigoration extends EcoEnchant {
         }
 
         double damageReduction = totalInvigorationPoints * this.getConfig().getDouble(EcoEnchants.CONFIG_LOCATION + "reduction-multiplier") * 0.01;
-        damageReduction += 1;
+        damageReduction -= 1;
         event.setDamage(event.getDamage() * damageReduction);
     }