[3.6] Project settings Audio category and subcategory incorrectly displaying / interacting.

### Tested versions

Reproducible: Godot 3.6 Stable, 3.6 beta 5
Not reproducible: Godot 3.5.3

### System information

Linux Mint 21.3

### Issue description

Project Settings -> Audio category collapsible acts as button with settings, General subsection below not found in Godot 3.5.3, those are 3.6 only features, like text to speech option.

Settings remain correct and reachable, but found out because search bar navigates correctly to the "hidden" section.

### Steps to reproduce

Any project should be able to access Project settings -> Audio

### Minimal reproduction project (MRP)

Any project should be able to access Project settings -> Audio