Remove warning "scrollEventThrottle" from iOS

[matheushf]

When using on iOS it throws a warning:

You specified `onScroll` on a <ScrollView> but not `scrollEventThrottle`. You will only receive one event. Using `16` you get all the events but be aware that it may cause frame drops, use a bigger number if you don't need as much precision.

Just setting it to 0 the default value, takes the warning away and everything remains as normal

[RodolfoGS]

👍