manager: remove curses dependent stuff from r375103

Upon further examination, this code was causing compliation problems on
CentOS at the least (possibly on any machine without curses) and also
the local value of COLS is used even with a remote console, so it is
less than ideal.

(issue ASTERISK-20396)
Reported by: Johan Wilfer


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@375175 65c4cc65-6c06-0410-ace0-fbb531ad65f3