Reverted partial r15186 it has been confirmed on a official server that sg doesn't do double damage on hitCount%3 == 0

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@15297 54d463be-8e91-2dee-dedb-b68131a5f0ec

src/map/battle.c

@@ -576,13 +576,6 @@ int battle_calc_damage(struct block_list *src,struct block_list *bl,struct Damag
 			status_heal(src, damage*sce->val4/100, 0, 3);
 
 	}
-	/**
-	 * Storm Gust doubles it's damage every 3 hits against' boss monsters
-	 * bugreport:1813
-	 **/
-	if ( sc && skill_num == WZ_STORMGUST && sc->sg_counter % 3 == 0 && (status_get_mode(bl)&MD_BOSS) ) {
-		damage += damage;
-	}
 
 	//SC effects from caster side.
 	sc = status_get_sc(src);