Fixed storm gust to always throw foe backwards from storm gust center, confirmed on official server

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@15296 54d463be-8e91-2dee-dedb-b68131a5f0ec

src/map/skill.c

@@ -2146,7 +2146,7 @@ int skill_attack (int attack_type, struct block_list* src, struct block_list *ds
 		switch(skillid)
 		{
 			case MG_FIREWALL:  direction = unit_getdir(bl); break; // backwards
-			case WZ_STORMGUST: direction = rand()%8;        break; // randomly
+			case WZ_STORMGUST: direction = unit_getdir(bl); break; // backwards
 			case PR_SANCTUARY: direction = unit_getdir(bl); break; // backwards
 			case WL_CRIMSONROCK: direction = map_calc_dir(bl,skill_area_temp[4],skill_area_temp[5]); break;