The animatedViewStyle property of the DropdownAlert component does not take effect, and the pop-up window turns black after setting, which is the same as iOS/Android

[Panlichen1996]

DropdownAlert 组件的 animatedViewStyle 属性不生效，设置之后弹窗变为黑色而非设置的red颜色，与 iOS/Android 一致

复现问题的demo：

alertProps: {
        animatedViewStyle: {backgroundColor: 'red'},
      }