[patch] Bold + bright black = dark black

[Ben Winslow]

I'm trying out rxvt-unicode, and I discovered that setting the color to 
bright black (\e[90m) while the bold attribute (\e[1m) is set results in 
black text (equivalent to \e[0;30m).  The other bright colors (91-97) do 
not exhibit this problem, e.g. \e[1;95m and \e[1;35m produce the same color.

The attached patch fixes this problem by correcting an off-by-one error 
in the fgcolor_of and bgcolor_of methods.

Cheers,
-- 
Ben Winslow <rain at bluecherry.net>
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