terminal.py: add support for mate-terminal in check_terminal_version()
Not currently used, but include for completeness.
(From OE-Core rev: dcceb90516efc77e4d0cddc3caf4e203ab9321d6)
Signed-off-by: Andre McCurdy <armccurdy@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>