Command line option to hide menu does not work on macOS

By default, the menu should be disabled, but it is always visible and enabled on macOS regardless of the `--menu` CLI option.

There seem to be quite a few problems with disabling the menu on macOS in Electron. I have build other Electron apps that are able to disable the menu on macOS, so I suppose the issue is related to the way the `kiosk-browser` is initializing the `BrowserWindow`. 