[Bug Report] toggle `disabled` attribute on el-pagination will make style wrong

[mokeyjay]

Element UI version

2.4.1

OS/Browsers version

Chrome66 & Edge40 & Firefox61 in Win10 x64 1703

Vue version

2.5.16

Reproduction Link

https://jsfiddle.net/mokeyjay/mmx38qxw/2271/

Steps to reproduce

• Encapsulate el-pagination as a component
• toggle its disabled attributes from outside
• then style wrong

What is Expected?

Style is kept in shape

What is actually happening?

height become 40px