Pipewire Screen Capture returns no data

### What Happened?

Trying to use the Wayland session in elementaryOS 8, you will not be able to start screen sharing either by selecting your display nor xdg-desktop-portal-pantheon in the picker. Sharing a single application is also impossible.

In programs like OBS or Discord it will simply return nothing, as if no output was chosen at all.

### Steps to Reproduce

1. Invoke the Pipewire Screen Capture Portal (e.g OBS, Discord, Firefox...)
2. Select any option.
3. Hit "share"
4. See bug

### Expected Behavior

Using any of the screen sharing options should allow the program in question to get a copy of your display or application output depending on your selection.

### OS Version

8.x (Early Access)

### Session Type

Secure Session (Wayland)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

relevant nvidia-smi output because I am running an Nvidia GPU with the proprietary drivers:
```
Sat Oct 5 18:37:05 2024
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 550.107.02 Driver Version: 550.107.02 CUDA Version: 12.4 |
|-----------------------------------------+------------------------+----------------------+
| GPU Name Persistence-M | Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap | Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|=========================================+========================+======================|
| 0 NVIDIA GeForce GTX 1060 3GB Off | 00000000:02:00.0 On | N/A |
| 37% 33C P8 8W / 120W | 970MiB / 3072MiB | 1% Default |
| | | N/A |
+-----------------------------------------+------------------------+----------------------+

```