set_menu_format in demo_menus.c

[Mike Gran]

Hi-

In the call to set_menu_format in demo_menus.c in the ncurses package, it looks 
like there is some confusion between the number of columns on the screen and 
the number of columns in the menu.  I think set_menu_format expects the latter, 
but, for very tiny screens, may be given the former in the current demo.

I think the attached patch is what was intended.

Thanks,

Mike Gran

demo_menus.c.patch
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