Character deletion deletes notepad item when selected

Created by: benvenker

@fkling, @coury-clark and I found a fairly nasty bug where, where it feels like the notepad is always deleting your block when you hit backspace in an annotation. What's actually happening is that clicking into the annotation doesn't deselect the notepad items outermost div: https://images.zenhubusercontent.com/41288708/f4290b79-dda3-4270-8c6f-96f496242cb9/cleanshot_2022_03_08_at_11_10_12.mp4