[Passwords] Propagate only_for_fallback through update branch

After this CL, update bubble will not be shown on non-password (i.e.
OTP, credit card) forms.

Bug: 1426542
Change-Id: Ifb4223b69ca5fe2adfb8a82994954a600355bb1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4370299


Reviewed-by: Maxim Kolosovskiy <kolos@chromium.org>
Commit-Queue: Din Nezametdinov <shaikhitdin@google.com>
Cr-Commit-Position: refs/heads/main@{#1123191}