Fix RANDR’s gamma_to_ramp().

In order to generate a 256-entry ramp in [0,65535] which covers the full
range, one must mupliply eight-bit values not by 256 but rather by 257.

Many years back – well before the RANDR extension was written, and
before xorg@fdo – a similar bug fix was made to the DIX for converting
client-supplied eight-bit color values into sixteen-bit values.

Noticed by: Elle Stone and Graeme Gill.

Signed-off-by: James Cloos <cloos@jhcloos.com>

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