gdiplus: fix a clipping regression in GdipDrawString (try 2)

[Rafał Mużyło]

Given the results in the bug, rect.Width = rect.Height = 0 seems to be
a result of either Graphics.DrawString(const WCHAR*, INT, const Font*,
const PointF, const Brush*) or Graphics.DrawString(const WCHAR*, INT,
const Font*, const PointF, const StringFormat*, const Brush*) call, so
clipping is meaningless.

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