gdiplus: do not call IPicture_Render directly from GdipDrawImageI

[Vincent Povirk]

Currently, GdipDrawImageI calls IPicture_Render directly. It should call on a more general function to make it easier to change the underlying implementation and to transform the points consistently based on the current graphics transform.

I've also reversed the current REAL -> INT call because fractional co-ordinates are useful when a graphics transform is applied.
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