### 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
ConfirmationDialog::_update_theme_item_cache();
	theme_cache.parent_folder = get_editor_theme_icon(SNAME("ArrowUp"));
	theme_cache.forward_folder = get_editor_theme_icon(SNAME("Forward"));
	theme_cache.back_folder = get_editor_theme_icon(SNAME("Back"));
	theme_cache.reload = get_editor_theme_icon(SNAME("Reload"));
	theme_cache.toggle_hidden = get_editor_theme_icon(SNAME("GuiVisibilityVisible"));
	theme_cache.favorite = get_editor_theme_icon(SNAME("Favorites"));
	theme_cache.mode_thumbnails = get_editor_theme_icon(SNAME("FileThumbnail"));
	theme_cache.mode_list = get_editor_theme_icon(SNAME("FileList"));
	theme_cache.favorites_up = get_editor_theme_icon(SNAME("MoveUp"));
	theme_cache.favorites_down = get_editor_theme_icon(SNAME("MoveDown"));
	theme_cache.folder = get_editor_theme_icon(SNAME("Folder"));
	theme_cache.folder_icon_color = get_theme_color(SNAME("folder_icon_color"), SNAME("FileDialog"));
	theme_cache.action_copy = get_editor_theme_icon(SNAME("ActionCopy"));
	theme_cache.action_delete = get_editor_theme_icon(SNAME("Remove"));
	theme_cache.filesystem = get_editor_theme_icon(SNAME("Filesystem"));
	theme_cache.folder_medium_thumbnail = get_editor_theme_icon(SNAME("FolderMediumThumb"));
	theme_cache.file_medium_thumbnail = get_editor_theme_icon(SNAME("FileMediumThumb"));
	theme_cache.folder_big_thumbnail = get_editor_theme_icon(SNAME("FolderBigThumb"));
	theme_cache.file_big_thumbnail = get_editor_theme_icon(SNAME("FileBigThumb"));
	theme_cache.progress[0] = get_editor_theme_icon("Progress1");
	theme_cache.progress[1] = get_editor_theme_icon("Progress2");
	theme_cache.progress[2] = get_editor_theme_icon("Progress3");
	theme_cache.progress[3] = get_editor_theme_icon("Progress4");
	theme_cache.progress[4] = get_editor_theme_icon("Progress5");
	theme_cache.progress[5] = get_editor_theme_icon("Progress6");
	theme_cache.progress[6] = get_editor_theme_icon("Progress7");
	theme_cache.progress[7] = get_editor_theme_icon("Progress8");
}
void EditorFileDialog::_notification(int p_what) {