Rename id in CLEAR_PLUGIN_STATE event

Summary:
There's been a bug here where the id was treated as a pluginId.
Renaming to make it clear.

Reviewed By: passy

Differential Revision: D16338884

fbshipit-source-id: 42c6c92653811d88cd37ebf4834346b1f0bb2c2a

src/dispatcher/server.js

@@ -38,7 +38,7 @@ export default (store: Store, logger: Logger) => {
     store.dispatch({
       type: 'CLEAR_PLUGIN_STATE',
       payload: {
-        id,
+        clientId: id,
         devicePlugins: new Set([
           ...store.getState().plugins.devicePlugins.keys(),
         ]),