listview : disable RemoveClippedSubviews prop

[s4njar]

removeClippedSubviews was enabled by default. It's useful for huge lists, with a lot of hidden items (not relevant in this library).

In some situations, with this option the list items are hidden until we scroll on them:

• https://github.com/facebook/react-native/issues/13316
• https://stackoverflow.com/questions/44022857/listview-not-displayed-unless-i-scroll-on-it
• https://github.com/facebook/react-native/issues/1831