Missing CORS headers

I just tried various 1.2.x version and none of them set any CORS headers, so even running on localhost is failing for me due to different ports.

I fixed that locally by editing `node_modules/@codeceptjs/ui/bin/codecept-ui.js` and change

```javascript
const io = require('socket.io')();
```

to

```javascript
const io = require('socket.io')({
cors: {
origin: "http://localhost:3333",
credentials: true,
methods: ["GET", "POST"],
transports: ['websocket', 'polling']
},
allowEIO3: true
});
```

A proper solution would require to make the origin configurable.