Blender Git Loki

Fix T78704: RenderPass normals disapear when view isn't updated

When the view isn't updated the renderpass thought that it was rendering
the next sample, skipping the conversion from encoded to blender
normals.

This patch resets the current sample when only rendering single sample
layers.

Reviewed By: Cl�ment Foucault

Differential Revision: https://developer.blender.org/D8280