[Desktop] Sync v2 - Favicon of synced Open Tabs are not synced.

[btlechowski]

We don't sync Favicons of synced Open Tabs

Steps to Reproduce

1. Create Sync chain
2. Enable syncing of Open Tabs in Sync Settings (brave://settings/braveSync/setup) on both devices
3. DeviceA: Open youtube.com
4. DeviceB: Open Hamburger Menu -> History

Important: Favicons are shown when the synced page is bookmarked
Important: Favicons are shown when the synced page is opened

Actual result:

Favicons of synced Open Tabs is not synced

Expected result:

Favicons are synced

Reproduces how often:

100% repro rate

Brave version (brave://version info)

Brave	1.12.102 Chromium: 84.0.4147.89 (Official Build) dev (64-bit)
Revision	19abfe7bcba9318a0b2a6bc6634a67fc834aa592-refs/branch-heads/4147@{#852}
OS	Ubuntu 18.04 LTS

cc @brave/legacy_qa @jsecretan @rebron @darkdh @AlexeyBarabash @petemill