### Godot version

v4.1.1.stable.official [bd6af8e0e]

### System information

Godot v4.1.1.stable - Debian GNU/Linux trixie/sid trixie - Vulkan (Compatibility) - Mesa Intel(R) HD Graphics 520 (SKL GT2) () - Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz (4 Threads)

### Issue description

After right clicking in thet "Filter Nodes" menu in the scene tree dock, the sub-menu is populated with a "Search" icon.

If I later switch themes in the same session, this icon is never updated to match the new theme.

![image](https://github.com/godotengine/godot/assets/660911/14336bb3-12ca-48c8-b030-8ada6ac27ec6)


### Steps to reproduce

1. Right click in the "Filter Nodes" menu in scene tree dock
2. Switch themes
3. Right click again in the "Filter Nodes" menu

Expected result: Icon has updated to match the theme I am currently using
Actual result: Icon is still using the theme I launched Godot with

### Minimal reproduction project

N/A
if (p_node) {
		bool editable = !EditorNode::get_singleton()->get_edited_scene()->is_editable_instance(p_node);
		EditorNode::get_singleton()->get_edited_scene()->set_editable_instance(p_node, editable);
		if (editable) {
			p_node->set_scene_instance_load_placeholder(false);
		}
		Node3DEditor::get_singleton()->update_all_gizmos(p_node);
		scene_tree->update_tree();
	}
}
void SceneTreeDock::_delete_confirm(bool p_cut) {
	List<Node *> remove_list = editor_selection->get_selected_node_list();
	if (remove_list.is_empty()) {
		return;
	}
	bool entire_scene = false;
	for (const Node *E : remove_list) {
		if (E == edited_scene) {
			entire_scene = true;
			break;