Update zombie_generate.sqf

Should fix: 
Error in expression <tNumber(configFile >> "CfgMagazines" >> _loot >> "count");
if(_loot_count>1) the>
  Error position: <_loot >> "count");
if(_loot_count>1) the>
  Error Undefined variable in expression: _loot
File z\addons\dayz_code\compile\zombie_generate.sqf, line 100
Error in expression <CLChances select _index;
_loot = _array select (_weights select (floor(random (c>
  Error position: <select (_weights select (floor(random (c>
  Error Zero divisor
File z\addons\dayz_code\compile\zombie_generate.sqf, line 98

when using DZE_MissionLootTable = true;
Fix was found on the epochmod.com forums.