Minor - UEFN - Attaching props in outliner will make an edit in the level file instead on the actor

Similar to how adding an actor creates a new file that is separate from the level file, it would be nice to have all actions that happen in the outliner also affect that actor instead of the level itself. This will prevent two creators that are working on the level at the same time and attaching/hiding actors to have edits overwritten in source control.