autocomplete: clear active item after selection

After an item is chosen, we should clear the selected item in the list view. The implementation is a little weird. I noticed that code was pretty old that I was editing :). This fixes a bug where the same item will be selected multiple times when it shouldn't be.
OK, but I don't think that can happen for this method, which is just going to set the active item for the autocomplete view, and not for list views in general. If you want me to make this change, can you please open a PR against my fork that implements your suggestion?