Tabs配置初始选择项无效，下划线会自动闪烁到第一个

[oneroundseven]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

2.2.0

Environment

windows7 RN: 0.55.4

Reproduction link

https://github.com/ant-design/ant-design-mobile-rn

Steps to reproduce

<Tabs tabs={this.state.tabs}
page={2}
initialPage={2}
renderTabBar={props=> <Tabs.DefaultTabBar {...props} page={3} />}
onChange={(tab, index)=> this._change(tab, index)} />

What is expected?

选中第三个

What is actually happening?

文字选中了第三个 下划线闪动到第一个

[BANG88]

#50