Patch: fix enable state of statistics dialog pie graph

Hi,

Log statistics dialog used to disable pie graph type based on number
of weeks, even if after large amount of weeks the graph turns into
months and so on. This was somewhat confusing, as after long log
history the pie graph would be disabled for no apparent reason.

The proper thing would be at least using GetUnitCount() instead of
m_nWeeks in CStatGraphDlg::OnCbnSelchangeGraphcombo(). However, I
think what makes most sense is just to enable the pie graph always.
The worst that can happen is that it will have 14 pies for weeks (at
15 weeks it turns into months already). The attached patch does that.

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

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