[iOS] Change pipes to backticks in /ios/web/public

Please review the CL to ensure that nothing is broken and the script
didn't miss some pipes.

This should allow us to have a better formatting in Xcode.

This CL was uploaded by git cl split.

R=ajuma@chromium.org

Bug: 1311955
Change-Id: Icce525bf2d94e8255331081fd1e9f04193a7a2cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3883678


Reviewed-by: Ali Juma <ajuma@chromium.org>
Commit-Queue: Ali Juma <ajuma@chromium.org>
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1044783}