fix bug with inspector clicking

Summary:
Previously, if you were already inspecting an element, touching again would
select a completely different element because the touch position was
calculated relative to the current overlay.

This fixes it.

@public

Test Plan:
Open the inspector, click around, verify that every click selects the thing
you clicked on.

Libraries/ReactIOS/InspectorOverlay.js

@@ -59,7 +59,7 @@ var InspectorOverlay = React.createClass({
         ? 'flex-start'
         : 'flex-end';
 
-      content.push(<View style={[styles.frame, this.state.frame]} />);
+      content.push(<View pointerEvents="none" style={[styles.frame, this.state.frame]} />);
       content.push(<ElementProperties hierarchy={this.state.hierarchy} />);
     }
     return (