For the background blur effect, it was found that destroying it and
then adding any other NVIDIA effect led to a blank picture.
This commit swaps the order of destroying the effect and the associated
cudaStream.
For other effects the order does not matter; I have no idea why the
order matters for blur effect and the SDK gives no indication about any
proper order at destruction time.
Fixes bug #11383.
Signed-off-by: pkv <pkv@obsproject.com>
2682ccc33c