[coreboot] [libpayload] fix curses drawing problem

[Jordan Crouse]

This fixes a curses drawing problem - characters are getting
accidently sign extended, which is badness for drawing characters
(i.e chars with values >= 128).  This works around the problem so
the right values get sent to VGA.

-- 
Jordan Crouse
Systems Software Development Engineer 
Advanced Micro Devices, Inc.
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