Fixed Skin Tempering (BS_SKINTEMPER) fire resistance percentage.

iRO wiki is wrong, it's 5% per level.

src/map/status.cpp

@@ -4063,7 +4063,7 @@ int status_calc_pc_(struct map_session_data* sd, enum e_status_calc_opt opt)
 		sd->subele[ELE_HOLY] += skill*5;
 	if((skill=pc_checkskill(sd,BS_SKINTEMPER))>0) {
 		sd->subele[ELE_NEUTRAL] += skill;
-		sd->subele[ELE_FIRE] += skill*4;
+		sd->subele[ELE_FIRE] += skill*5;
 	}
 	if((skill=pc_checkskill(sd,SA_DRAGONOLOGY))>0) {
 #ifdef RENEWAL