Summary:
iOS14 has introduced new styles for date picker. The default new calendar style breaks the old spinner type style.
This is a workaround to keep the spinner style as a default, until the calendar style is properly supported. According to [this github comment](https://github.com/react-native-community/datetimepicker/issues/285) it works well.
This will fix DatePicker for both Fabric and Paper, since Fabric uses the interop layer to render it.
Changelog: [Internal]
Reviewed By: fkgozali
Differential Revision: D23935328
fbshipit-source-id: 1a7fadba274e0537f0ac4ced60e23e7c809d57dc