Bug#1706: xterm sets wrong tty perms

[Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>]

Package: xbase
Version: 3.1.2-4

The default tty permissions in xterm are still 622.  They should be
changed to 620 or 600 (depending what should be the default: mesg y
or n), group tty.

Marek