[iOS] Update icons for Safety Check

Update the icons in the Settings root view and in the Safety Check
screen.

Bug: 1315544
Change-Id: I5e931f1b031b621f77fdd24235e99f8171c52f55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3894678
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Louis Romero <lpromero@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Louis Romero <lpromero@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1046952}