[IOS][LO] Fix onboarding animation slow loading time

The issue is fixed by updating the assets.

light mode: http://shortn/_vn7so7ahgr
dark mode: http://shortn/_KfLNUtRUWU

Bug: 373417068
Change-Id: I1703e9cd500c1f24f7404c4d5f76aa3f940e27a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5942721


Auto-Submit: Ameur Hosni <ameurhosni@google.com>
Reviewed-by: Radu Nitescu <radunitescu@google.com>
Commit-Queue: Radu Nitescu <radunitescu@google.com>
Cr-Commit-Position: refs/heads/main@{#1370645}