Fix build for Reactotron plugin

Summary: Fixed build for Reactotron plugin. It was broken because one of dependencies has statement "import * as React from 'react'" which transformed wrongly.

Reviewed By: passy

Differential Revision: D21178313

fbshipit-source-id: d700981a570dc8ded2080910e872b44976b850e8

desktop/babel-transformer/src/transform-plugin.ts

@@ -20,8 +20,8 @@ export default function transform({
   filename: string;
   options: any;
   src: string;
-  presets: any[];
-  plugins: any[];
+  presets?: any[];
+  plugins?: any[];
 }) {
   presets = presets ?? [require('@babel/preset-react')];
   plugins = plugins ?? [];