terminal_interface_unix.py: added missing colors

Added colors missing in linux but defined in win32.
Running pywikibot in linux now does not output uninterpreted colors
if tags not defined before are used (e.g. \03{green} ).

Change-Id: I31ce8fc3d90bb528740e6b107d201e4fed49c660
Merge "terminal_interface_unix.py: added missing colors"