`AudioServer.get_bus_peak_volume_left_db()` does not work in Web export for samples

### Tested versions

Issue is present in v4.3.stable.official [77dcf97d8]
Issue was not present in v4.2.2.stable.official [15073afe3]

### System information

Godot v4.3.stable - Windows 10.0.22631 - Vulkan (Mobile) - dedicated NVIDIA GeForce RTX 3070 (NVIDIA; 31.0.15.3623) - AMD Ryzen 5 3600X 6-Core Processor (12 Threads)

### Issue description

This is a video of the minimal reproducible example working in-editor:

https://github.com/user-attachments/assets/0fbdd409-2593-44a7-9fb7-70e0c28fdf98

The following is a photo, but the video would look exactly the same since the value does not update when exported to Web.


### Steps to reproduce

Export to web. Doesn't seem to matter which rendering mode is used.

### Minimal reproduction project (MRP)
This project uses three nodes:
A sound playing on a loop
A label updating with the value of AudioServer.get_bus_peak_volume_left_db(0,0)
A circle redrawing with size depending on the value of AudioServer.get_bus_peak_volume_left_db(0,0).

[repro.zip](https://github.com/user-attachments/files/17169218/repro.zip)

Start with the attached repro.zip, run it in the editor, then export it to Web and reproduce the unchanged AudioServer.get_bus_peak_volume_left_db(0,0) value. Compare the Web result with the working editor behavior; done means the label and circle update from the playing sample in the Web export as they do in the editor.

Written by the indexing model from the issue text.