Fixes Wind Blade and Wind Charm bonus (#5257)

* Fixes #5227.
* Wind Blade should only have a bonus of 10% per Wind Charm.

src/map/battle.cpp

@@ -6367,7 +6367,7 @@ struct Damage battle_calc_magic_attack(struct block_list *src,struct block_list
 						skillratio += 50;
 #endif
 						if(sd && sd->spiritcharm_type == CHARM_TYPE_WIND && sd->spiritcharm > 0)
-							skillratio += 20 * sd->spiritcharm;
+							skillratio += 10 * sd->spiritcharm;
 						break;
 					case NPC_ENERGYDRAIN:
 						skillratio += 100 * skill_lv;