add missing type to type definition file

[adrianolsk]

Is it a bugfix ?

• Yes Not direct related but https://github.com/leecade/react-native-swiper/issues/616 adding this will allow the next card preview

<Swiper
  scrollViewStyle={{ overflow: 'visible' }}
  removeClippedSubviews={false}
  ...

Is it a new feature ?

• no

Describe what you've done:

Add missing type for scrollViewStyle

[MatteoGauthier]

Still not merged 😂