[Desktop] Blocking Autoplay for All Sites (default) does not work

[btlechowski]

Follow up to #9597
Autoplay for All Sites does not work. It works for per site setting

Steps to Reproduce

1. Clean profile
2. Open brave://settings/content/autoplay
3. Set Autoplay to Blocked
   
4. Open https://www.bloomberg.com/video

Note: The per site setting shows that it is Block (default)

Actual result:

Autoplay is not blocked
Important: if Per site setting is changed to Block, it actually works and blocks autoplay

Expected result:

Autoplay is blocked

Reproduces how often:

100% repro rate

Brave version (brave://version info)

Brave	1.11.92 Chromium: 84.0.4147.68 (Official Build) dev (64-bit)
Revision	e7b7234037639b407e69c5428c891ce018cd6c0d-refs/branch-heads/4147@{#772}
OS	Ubuntu 18.04 LTS

Brave	1.12.81 Chromium: 84.0.4147.68 (Official Build) dev (64-bit)
Revision	e7b7234037639b407e69c5428c891ce018cd6c0d-refs/branch-heads/4147@{#772}
OS	Windows 7 Service Pack 1 (Build 7601.24544)

Brave	1.13.1 Chromium: 84.0.4147.68 (Oficjalna wersja) nightly (64-bitowa)
Wersja	e7b7234037639b407e69c5428c891ce018cd6c0d-refs/branch-heads/4147@{#772}
System operacyjny	Windows 7 Service Pack 1 (Build 7601.24544)

cc @darkdh @pes10k @brave/legacy_qa @rebron @bsclifton

[btlechowski]

Our goal is to eliminate the global autoplay switch eventually to match Chrome behavior.

Closing as invalid.