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When navigating to a webpage and then back to NTP using home button,
pressing fakebox to activate omnibox input reports context as NTP,
rather than NTP with fakebox/realbox as starting focus, though this does
not seem to be 100% the case, either.

This change ensures that plain NTP also triggers ZPS suggestions when
users navigate to NTP page by pressing the home button, and have the
On-Focus suggestions set to a non-default value (fixes possible
flakiness for test team)

Bug: 1004925
Change-Id: Id2930ad1651f23a3710d1e3124bd291a81e7bc28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1890497Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Ender <ender@google.com>
Cr-Commit-Position: refs/heads/master@{#711011}