support scrollEnabled prop for ScrollView

Author: flyskywhy

Libraries/ScrollView/ScrollView.web.js

@@ -166,7 +166,7 @@ class ScrollView extends Component {
       alwaysBounceVertical,
       style: ([
         styles.base,
-        this.props.horizontal ? styles.horizontal : null,
+        (this.props.horizontal && this.props.scrollEnabled) ? styles.horizontal : null,
         this.props.style,
       ]: ?Array<any>),
       onTouchStart: this.scrollResponderHandleTouchStart,