[bug report] El time picker: picker options are not valid when using is range time range

### Element UI version
2.13.0

### OS/Browsers version
WIN10/Google Chrome 版本 84.0.4115.5（正式版本）dev （64 位）

### Vue version
3.0.0-alpha.11

### Reproduction Link
https://jsfiddle.net/6Lb3s0z9/2/

### Steps to reproduce

-----------
:picker-options="{
selectableRange: ['00:00:00 - 12:59:59', '00:00:00 - 12:59:59']
}"限制无效

### What is Expected?
The time selector can disable the selection from 13:00:00 to 23:59:59
该时间选择器可以禁止选择13:00:00 - 23:59:59

### What is actually happening?
There are no restrictions on the optional time range
对可选时间范围没有做任何限制