[iOS] Extend Lens Overlay iPad compatibility flag expiry milestone

Change-Id: Idaf45aa53a9e9f74d3e8fb12ac6e075fdf0b96b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6239774
Reviewed-by: Ameur Hosni <ameurhosni@google.com>
Commit-Queue: Ameur Hosni <ameurhosni@google.com>
Auto-Submit: Radu Nitescu <radunitescu@google.com>
Commit-Queue: Radu Nitescu <radunitescu@google.com>
Cr-Commit-Position: refs/heads/main@{#1416730}