### Tested versions

- Reproducible in: v4.2.stable.arch_linux
- Not Reproducible in: v4.1.3.stable.official [f06b6836a]

### System information

Garuda Linux (2.6.19-2)

### Issue description

A minor issue where UI Icons are not rendering on the Group Editor window, attaching a screenshot for reference:
![Screenshot_604](https://github.com/godotengine/godot/assets/22623256/c366164a-3d9a-4dcf-97a0-199b5a5a7ecc)

The icons were expected for Buttons like Add, Remove, Filter, etc.

### Steps to reproduce

Select any Node and go to the `Node` panel, click `Manage Groups` and the window will open.

### Minimal reproduction project (MRP)

Minor issue, easily reproducible following the above steps.
nodes_to_add->clear();
	add_node_root = nodes_to_add->create_item();
	nodes_to_remove->clear();
	remove_node_root = nodes_to_remove->create_item();
	if (!groups->is_anything_selected()) {
		group_empty->hide();
		return;
	}
	selected_group = groups->get_selected()->get_text(0);
	_load_nodes(scene_tree->get_edited_scene_root());
	group_empty->set_visible(!remove_node_root->get_first_child());
}
void GroupDialog::_load_nodes(Node *p_current) {
	String item_name = p_current->get_name();
	if (p_current != scene_tree->get_edited_scene_root()) {
		item_name = String(p_current->get_parent()->get_name()) + "/" + item_name;
	}
	bool keep = true;
	Node *root = scene_tree->get_edited_scene_root();
	Node *owner = p_current->get_owner();
	if (owner != root && p_current != root && !owner && !root->is_editable_instance(owner)) {
		keep = false;
	}
	TreeItem *node = nullptr;