[Bf-python] Redraws in Scene.c

[Campbell Barton]

At the moment Scene.c redraws the camera view.
While working on my renderfarm script changing cameras crashed Blender 
while blender was running in non interactive mode.
Would anyone mind if I removed the redraw from the camera change. the 
user should realy be manually redrawing when needed anyway.

- Cam

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Campbell J Barton

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