[Bug Report] [action-sheet] can not scroll when the action sheet is longer then screen height

### Mint UI version
2.2.13

### OS/Browsers version
Mac / Chrome recent version

### Vue version
2.5.13

### Reproduction Link
[https://jsfiddle.net/firesh/g9a8hq7h/](https://jsfiddle.net/firesh/g9a8hq7h/)

### Steps to reproduce
1. click action sheet
2. try to scroll but can not scroll to the first action

### What is Expected?
Action sheet can be scrolled.

### What is actually happening?
Action sheet can not be scrolled.