Adjusted item drop minimum value limit (#2561)

* Fixes #2551.
* Lowered the item drop minimum value limits to be able to be set to 0.
Thanks to @mazvi!

src/map/battle.cpp

@@ -8151,22 +8151,22 @@ static const struct _battle_data {
 
 	// eAthena additions
 	{ "item_logarithmic_drops",             &battle_config.logarithmic_drops,               0,      0,      1,              },
-	{ "item_drop_common_min",               &battle_config.item_drop_common_min,            1,      1,      10000,          },
+	{ "item_drop_common_min",               &battle_config.item_drop_common_min,            1,      0,      10000,          },
 	{ "item_drop_common_max",               &battle_config.item_drop_common_max,            10000,  1,      10000,          },
-	{ "item_drop_equip_min",                &battle_config.item_drop_equip_min,             1,      1,      10000,          },
+	{ "item_drop_equip_min",                &battle_config.item_drop_equip_min,             1,      0,      10000,          },
 	{ "item_drop_equip_max",                &battle_config.item_drop_equip_max,             10000,  1,      10000,          },
-	{ "item_drop_card_min",                 &battle_config.item_drop_card_min,              1,      1,      10000,          },
+	{ "item_drop_card_min",                 &battle_config.item_drop_card_min,              1,      0,      10000,          },
 	{ "item_drop_card_max",                 &battle_config.item_drop_card_max,              10000,  1,      10000,          },
-	{ "item_drop_mvp_min",                  &battle_config.item_drop_mvp_min,               1,      1,      10000,          },
+	{ "item_drop_mvp_min",                  &battle_config.item_drop_mvp_min,               1,      0,      10000,          },
 	{ "item_drop_mvp_max",                  &battle_config.item_drop_mvp_max,               10000,  1,      10000,          },
 	{ "item_drop_mvp_mode",                 &battle_config.item_drop_mvp_mode,              0,      0,      2,              },
-	{ "item_drop_heal_min",                 &battle_config.item_drop_heal_min,              1,      1,      10000,          },
+	{ "item_drop_heal_min",                 &battle_config.item_drop_heal_min,              1,      0,      10000,          },
 	{ "item_drop_heal_max",                 &battle_config.item_drop_heal_max,              10000,  1,      10000,          },
-	{ "item_drop_use_min",                  &battle_config.item_drop_use_min,               1,      1,      10000,          },
+	{ "item_drop_use_min",                  &battle_config.item_drop_use_min,               1,      0,      10000,          },
 	{ "item_drop_use_max",                  &battle_config.item_drop_use_max,               10000,  1,      10000,          },
-	{ "item_drop_add_min",                  &battle_config.item_drop_adddrop_min,           1,      1,      10000,          },
+	{ "item_drop_add_min",                  &battle_config.item_drop_adddrop_min,           1,      0,      10000,          },
 	{ "item_drop_add_max",                  &battle_config.item_drop_adddrop_max,           10000,  1,      10000,          },
-	{ "item_drop_treasure_min",             &battle_config.item_drop_treasure_min,          1,      1,      10000,          },
+	{ "item_drop_treasure_min",             &battle_config.item_drop_treasure_min,          1,      0,      10000,          },
 	{ "item_drop_treasure_max",             &battle_config.item_drop_treasure_max,          10000,  1,      10000,          },
 	{ "item_rate_mvp",                      &battle_config.item_rate_mvp,                   100,    0,      1000000,        },
 	{ "item_rate_common",                   &battle_config.item_rate_common,                100,    0,      1000000,        },