Patch: darker statistics line graph colors

Hi,

Attached patch makes revision statistics line graph use darker line
colors when system window background color is light. Existing code was
using quite light colors (e.g. light yellow, light cyan) that are hard
to see in a line graph over a light background.

-- 
Aras Pranckevièius
work: http://unity3d.com
home: http://aras-p.info

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