autoPlay stays on 'Allow' when changed to 'Block'

[stortzm]

Description

'YouTube' autoPlay does not set to 'Block' on siteSettings

Steps to Reproduce

1. attempt to set siteSettings on youtube.com/ autoPlay set to Block
   https://i.ibb.co/nRVwSXV/Sem-t-tulo.jpg
2. the Block setting never stays on, it automatically switches to Allow

Actual result:

https://i.ibb.co/nRVwSXV/Sem-t-tulo.jpg

Expected result:

Block should be set; Instead, Allow stays on

Reproduces how often:

Brave version (brave://version info)

Brave	1.1.23 Chromium: 79.0.3945.88 (Official Build) (64-bit)
Revision	c2a58a36b9411c80829b4b154bfcab97e581f1f3-refs/branch-heads/3945@{#954}
OS	Windows 7 Service Pack 1 (Build 7601.24533)

Version/Channel Information:

• Can you reproduce this issue with the current release?
• Can you reproduce this issue with the beta channel?
• Can you reproduce this issue with the dev channel?
• Can you reproduce this issue with the nightly channel?

NA

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome?

NA

Miscellaneous Information:

NA

[srirambv]

Dupe of #3138. Added a +1 there