Fix ScrollView logspew

Summary: There was an inverted expression leading to logspew. Fix this.

Reviewed By: TheSavior

Differential Revision: D8758023

fbshipit-source-id: 7a83c68db6c95f2b5db6dcc7d7780fc66321b49e

Libraries/Components/ScrollView/ScrollView.js

@@ -774,7 +774,7 @@ const ScrollView = createReactClass({
       ScrollViewClass = RCTScrollView;
       ScrollContentContainerViewClass = RCTScrollContentView;
       warning(
-        this.props.snapToInterval != null || !this.props.pagingEnabled,
+        this.props.snapToInterval == null || !this.props.pagingEnabled,
         'snapToInterval is currently ignored when pagingEnabled is true.',
       );
     }