Fix fill behavior in an old AnimationSet demo.

FillEnabled/FillBefore/FillAfter have somewhat non-intuitive behavior.
The demo didn't work at all as intended, so I changed the animation resource
to reflect the actual behavior desired (delay starting the child animations
in the inner AnimationSet and avoid having those animations set the transform
before they start)

Change-Id: I135842091902ba243851dad0104f86e1b8605053
1 file changed