fix the wrong damage calculation

Author: Hongze Xu (FA TALENT)

src/main/java/net/infstudio/goki/common/handlers/CommonHandler.java

@@ -242,11 +242,11 @@ public void entityHurt(LivingHurtEvent event) {
                 }
             }
 
-            float damageMultiplier = Stats.PROTECTION.getAppliedBonus(player,
+            float damageMultiplier = 1.0F - (Stats.PROTECTION.getAppliedBonus(player,
                     source) + Stats.TOUGH_SKIN.getAppliedBonus(player,
                     source) + Stats.STAT_FEATHER_FALL.getAppliedBonus(player,
                     source) + Stats.TEMPERING.getAppliedBonus(player,
-                    source);
+                    source));
 
             event.setAmount(event.getAmount() * damageMultiplier);
         }