Do curses line-drawing right

[nthallen]

A couple references:

• https://www.unix.com/man-page/freebsd/3x/curs_addch/
• https://askubuntu.com/questions/602824/ncurses-line-drawing-not-working-on-console

[nthallen]

Resolved in 5b9b0b99d3479e395ce0ad3b6d848c6b129c6b2d