bug workaround when saving an event handler

Due to https://github.com/fish-shell/fish-shell/issues/845 the functions handling events are not activated upon load. Funcsave of the event handlers doesn't lead to proper results and should be avoided.
There's nothing wrong with using `funced` AFAIK, as that's not tied to saving functions, and I also don't think it's appropriate to call this a bug. It's not a bug, it's a natural consequence of autoloading functions on demand.