Boss Rush

Fix  
1. The Slugfest mode cannot correctly obtain items.  
2. The Slugfest mode cannot properly enter the item acquisition state.  
3. Some other minor bugs.  

Changes  
1. The default item quantity in the config file is no longer 0 but 1.

修复
1.鏖战模式无法正确获取物品
2.鏖战模式无法正常进入获取物品状态
3.其他的一些小bug
更改
1.config文件默认物品数量不再是0而是1