Fix loading plugins in dev mode

Summary: Fixed loading plugins in dev mode

Reviewed By: timur-valiev

Differential Revision: D21262894

fbshipit-source-id: c4ab6902d3153c3580c71f27df91290122627fae

desktop/app/src/utils/getDefaultPluginsIndex.tsx

@@ -9,5 +9,6 @@
 
 export default function () {
   // eslint-disable-next-line import/no-unresolved
-  return require('../defaultPlugins');
+  const index = require('../defaultPlugins');
+  return index.default || index;
 }