[skottie] Fix trim path mode interpretation

  "m": 1 -> parallel trim
  "m": 2 -> serial trim

(we had these backwards)

TBR=
Bug: skia:9599
Change-Id: Ib764c04a96c3a1e627553d8b8588028a411b5240
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/252796
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
2 files changed