'Throttling Behavior' setting is gone in the latest beta

[andy-d1969]

Describe the bug In the stable SteamVR client is a per application video setting to set the throttling behavior to fixed. This setting is gone in the latest beta. I needed this setting for a smoother gameplay.

To Reproduce Steps to reproduce the behavior:

1. Go to 'SteamVR Settings - Video'
2. Click on 'Per-Application Video Settings'
3. Scroll down to 'Throtting Behavior'
4. See that the setting is gone

Expected behavior This setting was important for me, because if a frame takes longer than ~10 ms to render the performance graph turns to orange and the frames are throttled. By setting the throttling behavior to 'fixed' the performance graph stays green, and the motion is smooth.

System Information (please complete the following information):

• Distribution: [Manjaro]
• SteamVR version: [1.21.8 beta]
• Steam client version: [lates beta]
• Opted into Steam client beta?: [Yes]
• Graphics driver version: [Mesa 22.1.0-devel (git-da719792ad)]
• Gist for SteamVR System Information: [See instructions]

Screenshots If applicable, add screenshots to help explain your problem.

Additional context Add any other context about the problem here.

Note: Commenters who are also experiencing this issue are encouraged to include the "System Information" section in their replies.