ui/ncurses: Handle arrow key variants

In the vt100 'application' cursor mode arrow keys produce ^[Ox rather
than the usual ^[[x. Add this pattern to our defined keys so we don't
accidentally catch the escape key.

For reference:
http://www.tldp.org/HOWTO/Keyboard-and-Console-HOWTO-21.html

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>