Figure out why dev script isn't working

[liammulh]

If you npm run dev, and then you go to the URL, (http://localhost:5173/, as of this writing), you will see Rosetta is having some sort of issue with CORS:

[Error] Origin http://localhost:5173 is not allowed by Access-Control-Allow-Origin. Status code: 200
[Error] XMLHttpRequest cannot load http://localhost:16372/services/check-login due to access control checks.
[Error] Failed to load resource: Origin http://localhost:5173 is not allowed by Access-Control-Allow-Origin. Status code: 200 (check-login, line 0)

This doesn't make a ton of sense to me, as I'm pretty sure I already dealt with this:

rosetta/src/server/app.js

Lines 37 to 48 in cc79110

	if ( publicConfig.ENVIRONMENT === 'development' ) {
	// Allow CORS requests from the React front end.
	// This is only needed for local development.
	app.use( cors( {
	origin: `http://127.0.0.1:${DEV_SERVER_PORT}`
	} ) );
	app.use( ( req, res, next ) => {
	res.setHeader( 'Access-Control-Allow-Credentials', 'true' );
	next();
	} );
	}

[jbphet]

I am using the dev script and not seeing the problems that are described above. I recent made a number of changes to the dev script for #435 - perhaps that fixed things. At any rate, this is no longer repeatable or problematic, so I'm going to close it.