Fix crash in ScrollView.scrollEventThrottle

Summary: Fix crash when casting `scrollEventThrottle`. `scrollEventThrottle` is passed as double from javascript.

Reviewed By: shergin

Differential Revision: D17626401

fbshipit-source-id: 0707a5a440fe7887e316054b455ba972a9291a18

ReactCommon/fabric/components/scrollview/ScrollViewProps.h

@@ -40,7 +40,7 @@ class ScrollViewProps final : public ViewProps {
   const bool scrollsToTop{true};
   const bool showsHorizontalScrollIndicator{true};
   const bool showsVerticalScrollIndicator{true};
-  const int scrollEventThrottle{};
+  const Float scrollEventThrottle{};
   const Float zoomScale{1.0};
   const EdgeInsets contentInset{};
   const EdgeInsets scrollIndicatorInsets{};