Blender Git Loki

Fix T75062: Frame Flashes During 3D Viewport Animation Playback

This issue became visible after fixing other TAA issues recently.
The sample count of the first frame wasn't reset resulting that the
incorrect resolve took place. This issue was already there beforehand,
it is just much clearer during the recent changes.

Now the `taa_sample will be reset when performing an animation playback
in the 3d viewport.