GRIM: Bind the background movies to a specific setup. Fix #679
(cherry picked from commit eef50769993ffd48c1348543839f5e3d41d1c6b5)
GRIM/Smush: Fix animations with width or height % 8 != 0. Remove previous hack.
(cherry picked from commit a08b6ae2e598a629099499f0416724a7c4f3564c)