Remove usage of deprecated @flow weak in Xplat

Summary:
This is the one usage of `flow weak` in Xplat - change it to normal `flow` and add a suppression where an error appears.

Changelog: [Internal]

Reviewed By: Hans-Halverson

Differential Revision: D24878970

fbshipit-source-id: 16e459c261b41e04de1555ed7ef4ecf2f5b3721e

packages/rn-tester/js/examples/PanResponder/PanResponderExample.js

@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  *
  * @format
- * @flow weak
+ * @flow
  */
 
 'use strict';
@@ -110,6 +110,7 @@ class PanResponderExample extends React.Component<Props, State> {
             }}
             style={[
               styles.circle,
+              // $FlowFixMe[incompatible-type]
               {
                 translateX: this.state.left,
                 translateY: this.state.top,