Add a todo for pbx_gtkconsole for updating to gtk2.

This module needs to be converted to gtk2, or we will eventually have to just
remove it from the tree.  gtk1 isn't even packaged anymore in the distro I'm
using.  I suspect nobody uses this and that nobody would notice if we removed
it.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@245384 65c4cc65-6c06-0410-ace0-fbb531ad65f3