macos: cmd + q should close the window not quit the app.

IPFS Desktop wants to help you keep your IPFS daemon running. Looking at other vaguely similar apps, they follow the pattern of running in the menubar, and `cmd` + `q` causes the open window to close, but does not quit the app. It continues to run in the menubar

Apps i've tested which do this

- Docker Desktop - closes the window, keeps docker in menubar, keeps docker daemon running
- Postgres.app - closes the window, keeps postgress in menubar, leaves postgres running.
- Keybase - closes window, keeps keybase in menubar