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Python: GPU Offscreen Rendering

When using python offscreen rendering the background was not drawn in
EEVEE. Users would expect that when calling the `draw_view3d` method
that it shows the same as in the 3d viewport.

Seems to be a difference between the meaning of draw_background in b279
and b280. In B279 the world background would be drawn. In B280 the
transparency is changed.

Reviewed By: campbellbarton, fclem

Maniphest Tasks: T61768

Differential Revision: https://developer.blender.org/D5022