fix(backend): Proper import of archived repo

Not really sure what happened, but clearly when I imported our backend
code into our monorepo, it was not the latest version.

So I'm fixing this now by putting in the latest code. I will re-apply
the changes since later.

packages/backend/src/middleware/express/cors.js

@@ -1,5 +1,5 @@
-import cors from "cors";
+import cors from 'cors'
 
-export default (app) => {
-  app.use(cors());
+export default app => {
+  app.use(cors())
 }