### Tested versions

Caused by [0d6300d269b818e6c3d3ea9cbc592480103aa6d0] Fix folder color not showing up in file dialogs
https://github.com/godotengine/godot/pull/84837
(git bisection)

### System information

Godot v4.3.dev (6faa5c6dc) - Fedora Linux 39 (Workstation Edition) - Wayland - Vulkan (Forward+) - dedicated AMD Radeon RX Vega (RADV VEGA10) () - AMD Ryzen 7 5800X 8-Core Processor (16 Threads)

### Issue description

When opening the export path, it results in a black popup.

![image](https://github.com/godotengine/godot/assets/270928/d67dee6a-f1e1-4bf3-8a3f-419554269f4a)


### Steps to reproduce

1. Open export settings
2. Add an export target
3. Try to select an export path

### Minimal reproduction project (MRP)

n/a
switch (p_what) {
		case NOTIFICATION_THEME_CHANGED:
		case Control::NOTIFICATION_LAYOUT_DIRECTION_CHANGED:
		case NOTIFICATION_TRANSLATION_CHANGED: {
			_update_icons();
			invalidate();
		} break;
		case NOTIFICATION_PROCESS: {
			if (preview_waiting) {
				preview_wheel_timeout -= get_process_delta_time();
				if (preview_wheel_timeout <= 0) {
					preview_wheel_index++;
					if (preview_wheel_index >= 8) {
						preview_wheel_index = 0;
					}
					Ref<Texture2D> frame = theme_cache.progress[preview_wheel_index];
					preview->set_texture(frame);
					preview_wheel_timeout = 0.1;
				}
			}
		} break;