No longer able to bind emote to flash

I used to be able to bind my emote key to the same key I used for flash. And that all worked until tonight when I went to play around with my bindings. I found that Riot made a change to multi-binding keys a while ago. But I had already had it that way before Riot made the change, so it stayed.

But you see my problem. There was no undo button so I couldn't change it back to being double bound.

I just want to thumbs up every time I flash :(