Reverted exp_calc_type back to '0' since it's definitely closer to official behavior than mode '1'.

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@13268 54d463be-8e91-2dee-dedb-b68131a5f0ec

conf/battle/exp.conf

@@ -41,7 +41,7 @@ max_exp_gain_rate: 0
 // 1 = uses damage given / max_hp as damage ratio
 // NOTE: Using type 1 disables the bonus where the first attacker gets 
 //       his share of the exp doubled when multiple people attack the mob.
-exp_calc_type: 1
+exp_calc_type: 0
 
 // Experience increase per attacker. That is, every additional attacker to the
 // monster makes it give this much more experience