modify the back key of luckchoice crash
	modified:   ../main/v_main/src/com/ruyicai/activity/buy/zixuan/ZiXuanTouZhu.java
	modified:   ../main/v_main/src/com/ruyicai/activity/buy/zixuan/ZixuanZhuihao.java
	modified:   src/com/ruyicai/activity/buy/zixuan/ZiXuanTouZhu.java
	modified:   src/com/ruyicai/activity/buy/zixuan/ZixuanZhuihao.java