[Bf-vfx] Behaviour change - when setting up tracking scene, keep the active layer

[Gottfried Hofmann]

Hello VFX folks,

When you hit "setup tracking scene" in MCE, the active layer usually 
switches to the layer where the ground has been created, thus he shadow 
layer. New objects are created or appended on that layer which means 
they will be default be rendered as shadows only. This behaviour 
requires muscle memory and is confusing for new users. This patch is 
changing the behaviour in a way that the active layer is remembered from 
before setting up the scene:

https://developer.blender.org/D574

Thoughts?

Cheers,
Gottfried

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