SteamVR "Display VR View" feature not working

## Description

Feature for mirroring VR View on desktop "Display VR View" always display a black screen. I'm not too sure if this is a problem from ALVR or SteamVR, but I figured I should report it. I have checked the Wiki, searched thru Issues and Googled to see if people has similar problem, even on Windows, nothing seems to show up.

## General Troubleshooting
- [x] I carefully followed the instructions in the [README](https://github.com/alvr-org/ALVR/blob/master/README.md) and successfully completed the setup wizard
- [x] I read the [ALVR GitHub Wiki](https://github.com/alvr-org/ALVR/wiki)

## Environment

### Hardware
**Note**: for Linux, an upload to the [`hw-probe`](https://linux-hardware.org/) database is preferred: `hw-probe -all -upload`
https://linux-hardware.org/?probe=ea97c66bb6

**CPU**: AMD Ryzen 3 5300G

**GPU**: NVIDIA GeForce RTX 3050 6GB & AMD ATI Radeon Vega Series

**GPU Driver Version**: 580.95.05

**Audio**: None. This is a headless unit.

### Installation
**ALVR Version**: 20.14.1

**ALVR Settings File**:

**SteamVR Version**: Tried on both 2.14.3 & 2.12.14

**Install Type**:
- [ ] Packaged (`exe`, `deb`, `rpm`, etc)
- [x] Portable (`zip`)
- [ ] Source

**OS Name and Version** (`winver` on Windows or `grep PRETTY_NAME /etc/os-release` on most Linux distributions): Debian GNU/Linux 12 (bookworm)