[ios] Fix compilation of assets catalog for maccatalyst

When building assets catalog for maccatalyst, the invocation of
actool needs to be passed `--platform macosx --target-device
ipad --ui-framework-family uikit` to correctly generate assets
that will work.

This was not correctly checked with previous version of Xcode
but from version 14.0 of Xcode, actool enforce that the flags
are correct.

Bug: none
Change-Id: Ic204cace0a8264795d4947cf0e621868f4c12bf0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3865278


Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1041590}