[skottie] Allow conincident keyframes

Relax the sanity check to allow parsing coincident keyframes.

The rest of the interpolation logic already handles these cases sanely.

Change-Id: Ib1eb762b2c36e9879971594dad859fbea5b87185
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/894376
Commit-Queue: Florin Malita <fmalita@google.com>
Reviewed-by: Jorge Betancourt <jmbetancourt@google.com>
2 files changed