Made bAtkRate add the rate rather than setting it. (bugreport:4499)

Warning: This will break backwards compatibility for item scripts which rely on the previous effect for this (although most people assumed it added, as described in the bonus doc).

git-svn-id: https://svn.code.sf.net/p/rathena/svn/branches/renewal@14456 54d463be-8e91-2dee-dedb-b68131a5f0ec

Changelog-Renewal.txt

@@ -1,6 +1,7 @@
 Date	Added
 
 2010/11/10
+	* Made bAtkRate add the rate rather than setting it. (bugreport:4499) [Paradox924X]
 	* Added an item_delay database usable for item-specific use delays. [Paradox924X]
 2010/11/09
 	* Use packet 0xe7 instead of 0x1f5 within clif_tradestart() when there is no trade_partner (or an invalid one) specified even for PACKETVER >= 6. (bugreport:4544) [Paradox924X]

src/map/battle.c

@@ -1396,7 +1396,7 @@ static struct Damage battle_calc_weapon_attack(struct block_list *src,struct blo
 				if(sd)
 				{
 					if (sd->atk_rate != 100)
-						ATK_RATE(sd->atk_rate);
+						ATK_ADDRATE(sd->atk_rate);
 
 					if(flag.cri && sd->crit_atk_rate)
 						ATK_ADDRATE(sd->crit_atk_rate);