Bug fixed: 出纳在现金支付时 qtip 在 FF 浏览器下异常

表现：当 qtip 内下拉菜单激活时，qtip DIV 立刻消失，
导致无法继续操作。Chrome 下正常，FF 下异常。

原因：qtip 'hide' option 设置有问题。
Bug fixed: When casier delete a expense record in
'/expense/', the original expense record will be deleted.
The right way is: only delete auth record, and reset the expense record's state.