vt: Drop a no longer true comment.

Some guy went on a patching spree, adding 24-bit colour support all around:
https://gist.github.com/XVilka/8346728

Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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