Do not enable locale layouts after locale switch during onboarding

The layouts will be synced instead. Also new user could enable required
layouts from the settings.

(cherry picked from commit a3160736)

Fixed: 1205116, b:189039715
Change-Id: I1c4d1ee56bb469ece6a8c51f9dbb6d3e5446bf1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3053362


Auto-Submit: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#905308}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3074545


Reviewed-by: Roman Aleksandrov <raleksandrov@google.com>
Commit-Queue: Gianluca Storto <gianluca@google.com>
Cr-Commit-Position: refs/branch-heads/4577@{#702}
Cr-Branched-From: 761ddde2-refs/heads/master@{#902210}