fullscreen command line switch stopped working

the command line switch `--fullscreen` stopped working after a recent update. previously, running

```shell
$ cool-retro-term --fullscreen
```

… opened a full screen terminal, but now it opens a windowed terminal.

i had this command bound to a shortcut for ‘instant hacker vibes’ 🤓 , but now that it stopped working i cannot show off anymore when someone walks past my desk 😿