### 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 (res->is_built_in() && !r_remap.has(res)) {
					_create_remap_for_resource(res, r_remap);
				}
			}
		}
	}
	for (int i = 0; i < p_node->get_child_count(); i++) {
		_create_remap_for_node(p_node->get_child(i), r_remap);
	}
}
void SceneTreeDock::_create_remap_for_resource(Ref<Resource> p_resource, HashMap<Ref<Resource>, Ref<Resource>> &r_remap) {
	r_remap[p_resource] = p_resource->duplicate();
	List<PropertyInfo> props;
	p_resource->get_property_list(&props);
	for (const PropertyInfo &E : props) {
		if (!(E.usage & PROPERTY_USAGE_STORAGE)) {
			continue;
		}
		Variant v = p_resource->get(E.name);
		if (v.is_ref_counted()) {
			Ref<Resource> res = v;
			if (res.is_valid()) {
				if (res->is_built_in() && !r_remap.has(res)) {
					_create_remap_for_resource(res, r_remap);
				}
			}
		}
	}
}
void SceneTreeDock::_list_all_subresources(PopupMenu *p_menu) {