### Godot version

4.0.3

### System information

Win7

### Issue description

#if and #else highlighted with the color same as if and else shader statement:

![image](https://github.com/godotengine/godot/assets/28286958/c2d58151-d6d2-4305-b4da-36e76e316caf)


### Steps to reproduce

1. Create shader
2. Add #if and #else

### Minimal reproduction project

N/A
bool use_autoreload = bool(EDITOR_GET("text_editor/behavior/files/auto_reload_scripts_on_external_change"));
	if (shader_inc.is_valid()) {
		if (shader_inc->get_last_modified_time() != FileAccess::get_modified_time(shader_inc->get_path())) {
			if (use_autoreload) {
				_reload_shader_include_from_disk();
			} else {
				disk_changed->call_deferred(SNAME("popup_centered"));
			}
		}
		return;
	}
	if (shader.is_null() || shader->is_built_in()) {
		return;
	}
	if (shader->get_last_modified_time() != FileAccess::get_modified_time(shader->get_path())) {
		if (use_autoreload) {
			_reload_shader_from_disk();
		} else {
			disk_changed->call_deferred(SNAME("popup_centered"));
		}
	}
}
void TextShaderEditor::_reload_shader_from_disk() {