### 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.
switch (p_what) {
		case NOTIFICATION_TRANSLATION_CHANGED:
		case Control::NOTIFICATION_LAYOUT_DIRECTION_CHANGED:
		case NOTIFICATION_ENTER_TREE:
		case NOTIFICATION_THEME_CHANGED: {
			if (is_layout_rtl()) {
				add_button->set_icon(groups->get_editor_theme_icon(SNAME("Back")));
				remove_button->set_icon(groups->get_editor_theme_icon(SNAME("Forward")));
			} else {
				add_button->set_icon(groups->get_editor_theme_icon(SNAME("Forward")));
				remove_button->set_icon(groups->get_editor_theme_icon(SNAME("Back")));
			}
			add_filter->set_right_icon(groups->get_editor_theme_icon(SNAME("Search")));
			add_filter->set_clear_button_enabled(true);
			remove_filter->set_right_icon(groups->get_editor_theme_icon(SNAME("Search")));
			remove_filter->set_clear_button_enabled(true);
		} break;
	}
}
void GroupDialog::edit() {