Make direct casting among Error and godot_error enums (#23015).

modules/gdnative/pluginscript/pluginscript_language.cpp

@@ -173,8 +173,7 @@ Error PluginScriptLanguage::complete_code(const String &p_code, const String &p_
 		for (int i = 0; i < options.size(); i++) {
 			r_options->push_back(String(options[i]));
 		}
-		Error err = *(Error *)&tmp;
-		return err;
+		return (Error)tmp;
 	}
 	return ERR_UNAVAILABLE;
 }