colors: use the proper ANSI sequence for 'reset'
colors: use the proper ANSI sequence for 'reset'

The more approprite 'reset' code is \33[0;m which resets all character
attributes to the terminal defaults.

See http://ascii-table.com/ansi-escape-sequences.php for details.

This change fixes the problem of poni leaving the terminal with strange
colours on exit.

ohmu/poni,ohmu/poni