[Sync] Fix Ash version of selected types histogram

This CL:
1. Adds Sync.SyncEverythingOS histogram analogous to
Sync.SyncEverything2, but reflecting user choice in OS Sync settings.
2. Fixes precondition for recording Sync.CustomOSSync. Instead of
checking "OS Sync Everything" disabled, it used to check
"Browser Sync Everything" disabled.

Bug: 1105956
Change-Id: I069bf22516cb19dcf64572302c9ea2a2f14a6a6c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3865878
Auto-Submit: Maksim Moskvitin <mmoskvitin@google.com>
Reviewed-by: Rushan Suleymanov <rushans@google.com>
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Cr-Commit-Position: refs/heads/main@{#1041534}