UI: Enable HW acceleration switch for browser sources on Mac

[pkviet]

This enables in Settings the checkbox for hardware acceleration for Browser Sources in macOS.
This requires cef 4183 and the following PRs:
#3933
obsproject/obs-browser#252

Description

Adds setting for hardware acceleration on macOS for browser sources.

Motivation and Context

Bring feature parity to macOS with windows.

How Has This Been Tested?

Checked that hw acceleration is toggled on and off by checking/unchecking the newly available checkbox in Settings > Advanced.

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• My code has been run through clang-format.
• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.