Fix Cygwin main menu

The extra -1 fixes this. I have no real idea why it isn't working without the -1, nor any idea if this breaks the main menu on other system,s but without it the Cygwin main menu looks like this:
http://i.imgur.com/Zf9P0Yn.png

(Maybe it's related to having screen sizes that don't match up with the menu options? My screen uses a width of 900, which you can't seem to get in the normal menu options.)