fix issue that breaks scroll views w/ RefreshControl on Android

Summary:
Fixes the issue I mentioned here #5623 (comment)
Closes #5784

Reviewed By: svcscm

Differential Revision: D2908112

Pulled By: nicklockwood

fb-gh-sync-id: 8a2f053de3f7dc19807ee21dd969c53a57b71345

Libraries/Components/ScrollView/ScrollView.js

@@ -530,7 +530,7 @@ var ScrollView = React.createClass({
         // AndroidSwipeRefreshLayout and use flex: 1 for the ScrollView.
         return React.cloneElement(
           refreshControl,
-          {style: this.props.style},
+          {style: props.style},
           <ScrollViewClass {...props} style={styles.base} ref={SCROLLVIEW}>
             {contentContainer}
           </ScrollViewClass>