programs in tutorial/ncurses

[小泉 悟]

Dear Liberty Eiffel community

I found most programs in tutorial/ncurses do not work.
I found out the reason of the bug is misuse of getmaxyx(), so I made pull 
request #191 for GitHub repository.
(getmaxyx() returns size of a window, so no need to subtract its base)
I have checked my patch works for FreeBSD (GhostBSD) and macOS.
I confirmed original programs do not work for Rocky Linux but I do not check 
patched programs.
 
Would you please check patched programs behavior on (any) Linux?
(In this case, I do not think the difference between BSD(-like) OS and Linux 
matters, but...)

KOIZUMI Satoru