[UPMLocalPwd] Call the account store when SyncService is initialized

With the store separation, the account store on android will also
need to know when the user is syncing passwords or not.

Note: For now, the account store on Android is meant to be used only
if the user enabled password sync. This is different than the
account store usage on other platforms.

This change has no effect on platforms other than Android.

Bug: b/306673712
Change-Id: I007ae083c2973fbae69a3955283acefd3fee6495
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5184137
Commit-Queue: Ioana Pandele <ioanap@chromium.org>
Reviewed-by: Mahmoud Rashad <mmrashad@google.com>
Cr-Commit-Position: refs/heads/main@{#1245365}